actions: Add pr-best-practices workflow

This commit adds the pr-best-practices check, which prevents pull
requests without descriptions being merged and which allows developers
to quickly create Jira Tasks based on the /jira-epic command in pull
request descriptions or comments.

.github/workflows/pr_best_practices.yml

@@ -0,0 +1,18 @@
+name: "Verify PR best practices"
+
+on:
+  pull_request_target:
+    branches: [main]
+    types: [opened, synchronize, reopened, edited]
+  issue_comment:
+    types: [created]
+
+jobs:
+  pr-best-practices:
+    runs-on: ubuntu-latest
+    steps:
+      - name: PR best practice check
+        uses: osbuild/pr-best-practices@main
+        with:
+          token: ${{ secrets.SCHUTZBOT_GITHUB_ACCESS_TOKEN }}
+          jira_token: ${{ secrets.IMAGEBUILDER_BOT_JIRA_TOKEN }}