feat(server): Implement and document security group attach/detach commands

docs/stackit_server.md

@@ -46,6 +46,7 @@ stackit server [flags]
 * [stackit server reboot](./stackit_server_reboot.md)	 - Reboots a server
 * [stackit server rescue](./stackit_server_rescue.md)	 - Rescues an existing server
 * [stackit server resize](./stackit_server_resize.md)	 - Resizes the server to the given machine type
+* [stackit server security-group](./stackit_server_security-group.md)	 - Allows attaching/detaching security groups to servers
 * [stackit server service-account](./stackit_server_service-account.md)	 - Allows attaching/detaching service accounts to servers
 * [stackit server start](./stackit_server_start.md)	 - Starts an existing server or allocates the server if deallocated
 * [stackit server stop](./stackit_server_stop.md)	 - Stops an existing server

docs/stackit_server_security-group.md

@@ -0,0 +1,35 @@
+## stackit server security-group
+
+Allows attaching/detaching security groups to servers
+
+### Synopsis
+
+Allows attaching/detaching security groups to servers.
+
+```
+stackit server security-group [flags]
+```
+
+### Options
+
+```
+  -h, --help   Help for "stackit server security-group"
+```
+
+### Options inherited from parent commands
+
+```
+  -y, --assume-yes             If set, skips all confirmation prompts
+      --async                  If set, runs the command asynchronously
+  -o, --output-format string   Output format, one of ["json" "pretty" "none" "yaml"]
+  -p, --project-id string      Project ID
+      --region string          Target region for region-specific requests
+      --verbosity string       Verbosity of the CLI, one of ["debug" "info" "warning" "error"] (default "info")
+```
+
+### SEE ALSO
+
+* [stackit server](./stackit_server.md)	 - Provides functionality for servers
+* [stackit server security-group attach](./stackit_server_security-group_attach.md)	 - Attaches a security group to a server
+* [stackit server security-group detach](./stackit_server_security-group_detach.md)	 - Detaches a security group from a server
+

docs/stackit_server_security-group_attach.md

@@ -0,0 +1,42 @@
+## stackit server security-group attach
+
+Attaches a security group to a server
+
+### Synopsis
+
+Attaches a security group to a server.
+
+```
+stackit server security-group attach [flags]
+```
+
+### Examples
+
+```
+  Attach a security group with ID "xxx" to a server with ID "yyy"
+  $ stackit server security-group attach --server-id yyy --security-group-id xxx
+```
+
+### Options
+
+```
+  -h, --help                       Help for "stackit server security-group attach"
+      --security-group-id string   Security Group ID
+      --server-id string           Server ID
+```
+
+### Options inherited from parent commands
+
+```
+  -y, --assume-yes             If set, skips all confirmation prompts
+      --async                  If set, runs the command asynchronously
+  -o, --output-format string   Output format, one of ["json" "pretty" "none" "yaml"]
+  -p, --project-id string      Project ID
+      --region string          Target region for region-specific requests
+      --verbosity string       Verbosity of the CLI, one of ["debug" "info" "warning" "error"] (default "info")
+```
+
+### SEE ALSO
+
+* [stackit server security-group](./stackit_server_security-group.md)	 - Allows attaching/detaching security groups to servers
+

docs/stackit_server_security-group_detach.md

@@ -0,0 +1,42 @@
+## stackit server security-group detach
+
+Detaches a security group from a server
+
+### Synopsis
+
+Detaches a security group from a server.
+
+```
+stackit server security-group detach [flags]
+```
+
+### Examples
+
+```
+  Detach a security group with ID "xxx" from a server with ID "yyy"
+  $ stackit server security-group detach --server-id yyy --security-group-id xxx
+```
+
+### Options
+
+```
+  -h, --help                       Help for "stackit server security-group detach"
+      --security-group-id string   Security Group ID
+      --server-id string           Server ID
+```
+
+### Options inherited from parent commands
+
+```
+  -y, --assume-yes             If set, skips all confirmation prompts
+      --async                  If set, runs the command asynchronously
+  -o, --output-format string   Output format, one of ["json" "pretty" "none" "yaml"]
+  -p, --project-id string      Project ID
+      --region string          Target region for region-specific requests
+      --verbosity string       Verbosity of the CLI, one of ["debug" "info" "warning" "error"] (default "info")
+```
+
+### SEE ALSO
+
+* [stackit server security-group](./stackit_server_security-group.md)	 - Allows attaching/detaching security groups to servers
+

internal/cmd/server/security-group/attach/attach.go

@@ -0,0 +1,119 @@
+package attach
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/stackitcloud/stackit-cli/internal/pkg/types"
+
+	"github.com/spf13/cobra"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/args"
+	cliErr "github.com/stackitcloud/stackit-cli/internal/pkg/errors"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/examples"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/flags"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/globalflags"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/print"
+	"github.com/stackitcloud/stackit-cli/internal/pkg/services/iaas/client"
+	iaasUtils "github.com/stackitcloud/stackit-cli/internal/pkg/services/iaas/utils"
+	"github.com/stackitcloud/stackit-sdk-go/services/iaas"
+)
+
+const (
+	serverIdFlag        = "server-id"
+	securityGroupIdFlag = "security-group-id"
+)
+
+type inputModel struct {
+	*globalflags.GlobalFlagModel
+	ServerId        string
+	SecurityGroupId string
+}
+
+func NewCmd(params *types.CmdParams) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "attach",
+		Short: "Attaches a security group to a server",
+		Long:  "Attaches a security group to a server.",
+		Args:  args.NoArgs,
+		Example: examples.Build(
+			examples.NewExample(
+				`Attach a security group with ID "xxx" to a server with ID "yyy"`,
+				`$ stackit server security-group attach --server-id yyy --security-group-id xxx`,
+			),
+		),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := context.Background()
+			model, err := parseInput(params.Printer, cmd, args)
+			if err != nil {
+				return err
+			}
+
+			// Configure API client
+			apiClient, err := client.ConfigureClient(params.Printer, params.CliVersion)
+			if err != nil {
+				return err
+			}
+
+			serverLabel, err := iaasUtils.GetServerName(ctx, apiClient, model.ProjectId, model.Region, model.ServerId)
+			if err != nil {
+				params.Printer.Debug(print.ErrorLevel, "get server name: %v", err)
+				serverLabel = model.ServerId
+			} else if serverLabel == "" {
+				serverLabel = model.ServerId
+			}
+
+			securityGroupLabel, err := iaasUtils.GetSecurityGroupName(ctx, apiClient, model.ProjectId, model.Region, model.SecurityGroupId)
+			if err != nil {
+				params.Printer.Debug(print.ErrorLevel, "get security group name: %v", err)
+				securityGroupLabel = model.SecurityGroupId
+			}
+
+			prompt := fmt.Sprintf("Are you sure you want to attach security group %q to server %q?", securityGroupLabel, serverLabel)
+			err = params.Printer.PromptForConfirmation(prompt)
+			if err != nil {
+				return err
+			}
+
+			// Call API
+			req := buildRequest(ctx, model, apiClient)
+			if err := req.Execute(); err != nil {
+				return fmt.Errorf("attach security group to server: %w", err)
+			}
+
+			params.Printer.Outputf("Attached security group %q to server %q\n", securityGroupLabel, serverLabel)
+
+			return nil
+		},
+	}
+	configureFlags(cmd)
+	return cmd
+}
+
+func configureFlags(cmd *cobra.Command) {
+	cmd.Flags().Var(flags.UUIDFlag(), serverIdFlag, "Server ID")
+	cmd.Flags().Var(flags.UUIDFlag(), securityGroupIdFlag, "Security Group ID")
+
+	err := flags.MarkFlagsRequired(cmd, serverIdFlag, securityGroupIdFlag)
+	cobra.CheckErr(err)
+}
+
+func parseInput(p *print.Printer, cmd *cobra.Command, _ []string) (*inputModel, error) {
+	globalFlags := globalflags.Parse(p, cmd)
+	if globalFlags.ProjectId == "" {
+		return nil, &cliErr.ProjectIdError{}
+	}
+
+	model := inputModel{
+		GlobalFlagModel: globalFlags,
+		ServerId:        flags.FlagToStringValue(p, cmd, serverIdFlag),
+		SecurityGroupId: flags.FlagToStringValue(p, cmd, securityGroupIdFlag),
+	}
+
+	p.DebugInputModel(model)
+	return &model, nil
+}
+
+func buildRequest(ctx context.Context, model *inputModel, apiClient *iaas.APIClient) iaas.ApiAddSecurityGroupToServerRequest {
+	req := apiClient.AddSecurityGroupToServer(ctx, model.ProjectId, model.Region, model.ServerId, model.SecurityGroupId)
+	return req
+}