Add workflow to create draft releases

.github/workflows/release.yml

@@ -0,0 +1,30 @@
+name: Release
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [master]
+
+permissions: {}
+
+jobs:
+  draft-release:
+    if: |
+      github.event.pull_request.merged == true &&
+      startsWith(github.event.pull_request.head.ref, 'releases/')
+    runs-on: ubuntu-latest
+    permissions:
+      # Required to create the draft release.
+      contents: write
+      # Required to comment the draft release on the pull request.
+      pull-requests: write
+
+    steps:
+      # Ideally, we'd also update the link pointing to our process docs in the
+      # README.md file when this version changes.
+      - uses: mozilla/addons/.github/actions/release@442a70320c838d93bd0c34708471b8c5ca7ce86f # 1.1
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.event.pull_request.merge_commit_sha }}
+          pr: ${{ github.event.pull_request.number }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -283,5 +283,10 @@ Here is a partial list of examples:
     [signing](https://addons-server.readthedocs.io/en/latest/topics/api/v4_frozen/signing.html)
     extensions.
 
-[web-ext-user-docs]: https://extensionworkshop.com/documentation/develop/getting-started-with-web-ext/
+## Releases
+
+This project follows the [semantic versioning](https://semver.org/) specification. To release a new version of this library on npmjs.org, please see [our release process][].
+
 [dynamic-imports]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#dynamic_imports
+[our release process]: https://github.com/mozilla/addons/tree/1.1/.github/actions/release#release-process
+[web-ext-user-docs]: https://extensionworkshop.com/documentation/develop/getting-started-with-web-ext/