ci: create github release on version tags

Author: ClaudiuCeia

.github/workflows/publish.yml

@@ -46,3 +46,61 @@ jobs:
         run: npm publish ./npm --access public
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+  github-release:
+    runs-on: ubuntu-latest
+    needs: [publish-jsr, publish-npm]
+
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Verify tag matches deno.json version
+        shell: bash
+        run: |
+          set -euo pipefail
+          tag="${GITHUB_REF_NAME}"
+          version="${tag#v}"
+          deno_version="$(node -p "require('./deno.json').version")"
+          if [[ "${deno_version}" != "${version}" ]]; then
+            echo "Tag '${tag}' does not match deno.json version '${deno_version}'."
+            exit 1
+          fi
+
+      - name: Generate changelog
+        shell: bash
+        run: |
+          set -euo pipefail
+          tag="${GITHUB_REF_NAME}"
+
+          prev_tag="$(
+            git tag --list "v*" --sort=-version:refname \
+              | grep -v "^${tag}$" \
+              | head -n 1 || true
+          )"
+
+          {
+            echo "# ${tag}"
+            echo
+            if [[ -n "${prev_tag}" ]]; then
+              echo "Changes since ${prev_tag}:"
+              echo
+              git log --no-merges --pretty=format:"- %s (%h)" "${prev_tag}..${tag}"
+            else
+              echo "Changes:"
+              echo
+              git log --no-merges --pretty=format:"- %s (%h)" "${tag}"
+            fi
+            echo
+          } > RELEASE_NOTES.md
+
+      - name: Create GitHub release
+        uses: softprops/action-gh-release@v2
+        with:
+          name: ${{ github.ref_name }}
+          tag_name: ${{ github.ref_name }}
+          body_path: RELEASE_NOTES.md