Add push_gem workflow, update docs & scripts

Author: Spone

.github/workflows/push_gem.yml

@@ -0,0 +1,38 @@
+name: Push Gem
+
+on:
+  push:
+    tags:
+      - v*
+
+permissions:
+  contents: read
+
+jobs:
+  push:
+    if: github.repository == 'ViewComponent/view_component'
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      id-token: write
+
+    # GitHub environment configured on RubyGems
+    environment: release
+
+    steps:
+      # Set up
+      - name: Harden Runner
+        uses: step-security/harden-runner@v2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+
+      # Release
+      - uses: rubygems/release-gem@v1

docs/CONTRIBUTING.md

@@ -98,6 +98,8 @@ To run the Vale prose linter locally, `brew install vale` and `vale docs/`.
 
 `./script/release`
 
+To improve software supply chain safety, new gem versions are automatically pushed to RubyGems by Github Actions, thanks to [Trusted Publishing](https://guides.rubygems.org/trusted-publishing/).
+
 ## Governance
 
 ViewComponent is built by over a hundred members of the community. Project membership has several levels:

script/publish

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 # Publish gem
-bundle exec rake release
+# this step has been replaced by .github/workflows/push_gem.yml
 
 # Publish updated docs
 git branch -D gh-pages

script/release

@@ -82,7 +82,9 @@ push() {
 
   echo "####################################################"
   echo "Now, open a PR with this branch and merge it to main"
-  echo "Then, run script/publish on main to release the gem"
+  echo "Then, run script/publish on main to publish the docs"
+  echo "The gem will be pushed to RubyGems automatically by"
+  echo "Github Actions, using Trusted Publishing."
   echo "Finally, create a GitHub release https://github.com/viewcomponent/view_component/releases/new with the changes from docs/CHANGELOG"
   echo "####################################################"
 }