Add /.bundle/ to gitignore and remove .bundle/config

[leotm]

Summary:

• update .gitignore to include /.bundle/
• remove /.bundle/config

bundle install --deployment dirtifies the git state
causing the tracked local Bundler config yaml to drift overwriting it

from

template/template/_bundle/config

Lines 1 to 2 in 620f5a4

	BUNDLE_PATH: "vendor/bundle"
	BUNDLE_FORCE_RUBY_PLATFORM: 1

to

---
BUNDLE_PATH: "vendor/bundle"
BUNDLE_FORCE_RUBY_PLATFORM: "1"
BUNDLE_DEPLOYMENT: "true"

in ephemeral CI environments and local testing (unintended afaik)

official convention is to gitignore /.bundle/
https://github.com/github/gitignore/blob/main/Ruby.gitignore#L42
and standard convention https://devcenter.heroku.com/articles/bundler-configuration

was likely an oversight to force it in VC earlier

• Introduce Gemfile, ruby-version facebook/react-native#32303 (circa RN 0.68)

if still wanting to isolate the path from the global OS folder
bundle config set --local path 'vendor/bundle' (run once per project)
BUNDLE_PATH=vendor/bundle bundle install (or in CI or a script)
bundle install --path vendor/bundle (deprecated)

however this also means running once per project
bundle config set --local force_ruby_platform true
meaning if Gemfile.lock were recreated PLATFORMS stick to ruby
so perhaps we don't want this change

a compromise could be
phase 1 add /.bundle/ to gitignore in template
phase 2 run both bundle config commands under-the-hood on RNCLI init (or simpler add the config strings w touch)
phase 3 [dust settles] remove .bundle/config from template

nit: adding to gitignore also prevents release.yaml from detecting then creating accidental commits of CI-specific Bundler state

template/.github/workflows/release.yaml

Lines 51 to 54 in 620f5a4

	if [ -z "$("${GIT[@]}" status --porcelain)" ]; then
	echo "No changes, a previous release might have failed at the publish step. Continue to retry."
	exit 0
	fi

if one of the /scripts run earlier were to trigger a Ruby command

Changelog:

[GENERAL] [FIXED] - Add /.bundle/ to .gitignore and remove local Bundler config

Test Plan:

Before

npx @react-native-community/cli@latest init AwesomeProject
.bundle/config exists
bundle install # creates local project vendor folder, 33MB for empty project

After

npx @react-native-community/cli@latest init AwesomeProject
.bundle/config # no longer pollutes the repo to create git conflicts
bundle install # no longer creates local project vendor folder

Unchanged

bundle install --deployment # still creates local project vendor folder as expected
bundle config set deployment true && bundle install # still creates local project vendor folder as expected
BUNDLE_PATH="vendor/bundle" bundle install # still creates local project vendor folder as expected, opt-in