GitHub Actions: Pin actions to SHA hashes (#156)

Add dependabot checks for GitHub Actions

Author: bshand

.github/dependabot.yml

@@ -0,0 +1,13 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    cooldown:
+      default-days: 7 # Wait 7 days after publication

.github/workflows/lint.yml

@@ -9,11 +9,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # actions/checkout@v6 see https://github.com/actions/checkout/releases/tag/v6
       with:
         fetch-depth: 0 # fetch everything
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@4c56a21280b36d862b5fc31348f463d60bdc55d5 # ruby/setup-ruby@v1 see https://github.com/ruby/setup-ruby/tree/v1
       with:
         ruby-version: 3.4
     - name: Install dependencies

.github/workflows/test.yml

@@ -43,9 +43,9 @@ jobs:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # actions/checkout@v6 see https://github.com/actions/checkout/releases/tag/v6
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@4c56a21280b36d862b5fc31348f463d60bdc55d5 # ruby/setup-ruby@v1 see https://github.com/ruby/setup-ruby/tree/v1
       with:
         ruby-version: ${{ matrix.ruby-version }}
     - name: Install dependencies