ci: create GitHub release with changelog notes on tag push

Author: dialupdisaster

.github/workflows/release.yml

@@ -6,7 +6,7 @@ on:
       - "v*"
 
 permissions:
-  contents: read
+  contents: write
   id-token: write
 
 jobs:
@@ -40,3 +40,28 @@ jobs:
 
       - name: Publish to npm
         run: npm publish --provenance --access public
+
+      - name: Extract changelog entry
+        id: changelog
+        run: |
+          VERSION="${GITHUB_REF_NAME#v}"
+          NOTES=$(awk "/^## \[${VERSION}\]/{found=1; next} found && /^## \[/{exit} found{print}" CHANGELOG.md)
+          echo "notes<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$NOTES" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
+
+      - name: Create GitHub release
+        uses: actions/github-script@v7
+        with:
+          script: |
+            await github.rest.repos.createRelease({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              tag_name: context.ref.replace('refs/tags/', ''),
+              name: context.ref.replace('refs/tags/', ''),
+              body: process.env.RELEASE_NOTES,
+              draft: false,
+              prerelease: false,
+            })
+        env:
+          RELEASE_NOTES: ${{ steps.changelog.outputs.notes }}