.github: Add pr-job-dispatcher workflow

This will automatically run on PR creation and repush.  It will check if only docs files have been modified and, if so, will trigger the PR status faker workflow.  If it is not a docs-only PR, it will dispatch the regular Jenkins jobs we run for every PR.

Signed-off-by: David Galloway <david.galloway@ibm.com>

diff --git a/.github/workflows/pr-job-dispatcher.yml b/.github/workflows/pr-job-dispatcher.yml
new file mode 100644 (file)
index 0000000..4827943
--- /dev/null
+++ b/.github/workflows/pr-job-dispatcher.yml
@@ -0,0 +1,128 @@
+name: Pull Request Job Dispatcher
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  pr-job-dispatcher:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: read
+      contents: read
+    outputs:
+      only_docs: ${{ steps.check-if-docs-only-pr.outputs.only_docs }}
+      only_container: ${{ steps.check-if-container-only-pr.outputs.only_container }}
+      pr_number: ${{ steps.get-pr-metadata.outputs.pr_number }}
+      pr_sha: ${{ steps.get-pr-metadata.outputs.pr_sha }}
+
+    steps:
+      - name: Get PR metadata
+        id: get-pr-metadata
+        run: |
+          echo "pr_number=${{ github.event.pull_request.number }}" >> "$GITHUB_OUTPUT"
+          echo "pr_sha=${{ github.event.pull_request.head.sha }}" >> "$GITHUB_OUTPUT"
+
+      - name: Get list of changed files
+        id: get-pr-changed-files
+        uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c
+
+      - name: Check if only docs-related files changed
+        id: check-if-docs-only-pr
+        run: |
+          is_docs_file() {
+            local f="$1"
+            [[ "$f" == doc/* ||
+               "$f" == admin/* ||
+               "$f" == src/sample.ceph.conf ||
+               "$f" == CodingStyle ||
+               "$f" == *.rst ||
+               "$f" == *.md ||
+               "$f" == COPYING* ||
+               "$f" == README.* ||
+               "$f" == SubmittingPatches ||
+               "$f" == .readthedocs.yml ||
+               "$f" == PendingReleaseNotes ]] && return 0
+            return 1
+          }
+      
+          only_docs=true
+
+          changed_files="${{ steps.get-pr-changed-files.outputs.all_changed_files }}"
+          for file in $changed_files; do
+            echo "Checking: [$file]"
+            if ! is_docs_file "$file"; then
+              echo "$file is not a docs file"
+              only_docs=false
+              break
+            fi
+          done
+
+          echo "only_docs=$only_docs" >> "$GITHUB_OUTPUT"
+
+      - name: Check if only container-related files changed
+        id: check-if-container-only-pr
+        run: |
+          is_container_file() {
+            local f="$1"
+            [[ "$f" == container/* ||
+               "$f" == Dockerfile.build ||
+               "$f" == src/script/buildcontainer-setup.sh ||
+               "$f" == src/script/build-with-container.py ]] && return 0
+            return 1
+          }
+      
+          only_container=true
+
+          changed_files="${{ steps.get-pr-changed-files.outputs.all_changed_files }}"
+          for file in $changed_files; do
+            echo "Checking: [$file]"
+            if ! is_container_file "$file"; then
+              echo "$file is not a container file"
+              only_container=false
+              break
+            fi
+          done
+
+          echo "only_container=$only_container" >> "$GITHUB_OUTPUT"
+
+  trigger-fake-status-checks:
+    if: needs.pr-job-dispatcher.outputs.only_docs == 'true' || needs.pr-job-dispatcher.outputs.only_container == 'true'
+    permissions:
+      pull-requests: read
+      statuses: write
+    needs: pr-job-dispatcher
+    uses: ./.github/workflows/pr-checks-faker.yml
+    with:
+      pr_number: ${{ needs.pr-job-dispatcher.outputs.pr_number }}
+      pr_sha: ${{ needs.pr-job-dispatcher.outputs.pr_sha }}
+      triggered_by: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}
+
+  trigger-jenkins-jobs:
+    if: needs.pr-job-dispatcher.outputs.only_docs != 'true' && needs.pr-job-dispatcher.outputs.only_container != 'true'
+    permissions:
+      contents: read
+      pull-requests: read
+    needs: pr-job-dispatcher
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Jenkins jobs with parameters
+        run: |
+          GH_PULL_REQUEST_ID="${{ needs.pr-job-dispatcher.outputs.pr_number }}"
+          GH_PULL_REQUEST_SHA="${{ needs.pr-job-dispatcher.outputs.pr_sha }}"
+          
+          for job in ceph-pull-requests ceph-pull-requests-arm64 ceph-windows-pull-requests ceph-api; do
+            echo "Triggering $job ..."
+            for attempt in {1..5}; do
+              curl --fail --retry 4 --retry-delay 5 --retry-connrefused \
+                -X POST "https://jenkins.ceph.com/job/$job/buildWithParameters" \
+                --user "${{ secrets.JENKINS_USER }}:${{ secrets.JENKINS_API_TOKEN }}" \
+                --data-urlencode "GH_PULL_REQUEST_ID=$GH_PULL_REQUEST_ID" \
+                --data-urlencode "GH_PULL_REQUEST_SHA=$GH_PULL_REQUEST_SHA" \
+                --data-urlencode "TRIGGER_METHOD=Branch push" \
+                --data-urlencode "TRIGGERED_BY=https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" && break
+          
+              echo "Attempt $attempt for $job failed. Retrying..."
+              sleep 3
+            done
+          done