Add GitHub action bot to re-run failed jobs (#14004)

Closes #14002

.github/workflows/github-action-bot.yml

@@ -0,0 +1,25 @@
+name: Keycloak GitHub bot
+
+# This GitHub bot listens on comments in the repository and reruns failed GitHub actions:
+# When adding a new comment '/rerun' as is on a pull request that is open, the bot will re-run any failed jobs in a workflow run.
+# The user commenting needs to be either a collaborator, an owner, a member of the organization or a contributor.
+
+# See https://github.com/keycloak/keycloak-gh-actionbot for more information
+
+on:
+  issue_comment:
+    types:
+      - created
+
+permissions:
+  actions: write
+  pull-requests: write
+
+jobs:
+  act:
+    runs-on: ubuntu-latest
+    steps:
+      # to avoid a tag being changed afterwards, use the commit hash of the action
+      - uses: keycloak/keycloak-gh-actionbot@c76e6c1ce249dac0278652c2f94f743fe5bb9bcd # v0.1.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}