Merge pull request #23 from jenkinsci/release-drafter-github-action

#20 - Document the Release Drafter GitHub Action

.github/release-drafter.adoc

@@ -11,7 +11,12 @@ This page provides some usage information.
 
 == Usage
 
-=== Enabling Release Drafter in a repository
+Release drafter can be used as a GitHub Application or as a GitHub action.
+It is up to the plugin maintainers to chose the way how they use Release Drafter.
+The only notable difference is that GitHub Application does not produce logs which would be available to plugin maintainers,
+and hence it might be difficult to troubleshoot errors if they occur.
+
+=== Enabling Release Drafter GitHub App in a repository
 
 NOTE: Release Drafter requires full write, because GitHub does not offer a limited scope for only writing releases. 
 **Don't install Release Drafter to your entire GitHub account — only add the repositories you want to draft releases on.**
@@ -22,6 +27,40 @@ In the Jenkins organization we recommend using the GitHub app at the moment.
 * If you have an Admin access to the GitHub repo, you can just configure the application on https://github.com/apps/release-drafter
 * Otherwise, create an INFRA ticket with `component=github` for enabling Release Drafter in the repo
 
+=== Enabling Release Drafter GitHub Action in a repository
+
+It is possible to use a standard Release Drafter as a GitHub action, see the documentation link:[here].
+For Jenkins there is also a link:https://github.com/oleg-nenashev/jenkins-release-drafter[oleg-nenashev/jenkins-release-drafter] fork which includes some fixes which have not been released in upstream yet.
+
+Sample configuration:
+
+```yaml
+# Automates creation of Release Drafts using Release Drafter
+# More Info: https://github.com/jenkinsci/.github/blob/master/.github/release-drafter.adoc
+name: Release Management
+
+on:
+  push:
+    # branches to consider in the event; optional, defaults to all
+    branches:
+      - master
+
+jobs:
+  update_draft_release:
+    runs-on: ubuntu-latest
+    steps:
+      # Drafts your next Release notes as Pull Requests are merged into "master"
+      - uses: oleg-nenashev/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+Examples:
+
+* Official Release drafter: link:https://github.com/jenkinsci/bitbucket-branch-source-plugin/blob/master/.github/workflows/release-management.yml[BitBucket Branch Source Plugin]
+* Customized Release Drafter: link:https://github.com/jenkinsci/gradle-plugin/blob/master/.github/workflows/release-drafter.yml[Gradle Plugin]
+
+
 === Configuring Release Drafter
 
 After enabling the application, it needs to be configured in `.github/release-drafter.yml` in the master branch of your repository.