ci: replace pull_request_target with two-step workflows (#841)

* ci: update PR auto assign workflows

Signed-off-by: Andy Lee <andy.lee@suse.com>

* ci: update backport label workflow

Signed-off-by: Andy Lee <andy.lee@suse.com>

* ci: update backport PR via mergify workflow

Signed-off-by: Andy Lee <andy.lee@suse.com>

* ci: update add PR label workflow

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: file name

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: limit auto-assign-check for target branches

Signed-off-by: Andy Lee <andy.lee@suse.com>

---------

Signed-off-by: Andy Lee <andy.lee@suse.com>

.github/workflows/backport-label.yaml

@@ -1,40 +1,44 @@
-name: "[PR Management] Add Labels"
+name: "[PR Management] Add Backport Labels"
 
 on:
-  pull_request_target:
-    types: [opened, reopened]
-    branches:
-      - main
-      - 'release-harvester-v*'
-
-permissions:
-  pull-requests: write
+  workflow_run:
+    workflows:
+      - "[PR Management] Add Labels Collect Data"
+    types: [completed]
 
 jobs:
   add-require-backport-label:
-    if: github.event.pull_request.draft == false &&
-        github.event.pull_request.base.ref == 'main'
     runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    permissions:
+      actions: read
+      pull-requests: write
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - name: Download PR data artifact
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
-          ref: ${{ github.base_ref }}
+          name: pr-backport-label-data
+          run-id: ${{ github.event.workflow_run.id }}
+          github-token: ${{ github.token }}
 
-      - name: Fetch release branches and PR labels
-        id: fetch_info
+      - name: Load PR data
+        run: |
+          cat pr-backport-label-data.env >> $GITHUB_ENV
+
+      - name: Add require-backport label (main branch PRs)
+        if: env.PR_BASE_REF == 'main'
         env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ github.token }}
         run: |
           set -euo pipefail
 
           repo="${{ github.repository }}"
-          pr_number=${{ github.event.pull_request.number }}
+          pr_number="$PR_NUMBER"
 
           release_branches=$(gh api "repos/${repo}/branches" --paginate --jq '.[].name' | grep -E '^release-harvester-v[0-9]+\.[0-9]+$' || true)
 
           if [[ -z "$release_branches" ]]; then
-            echo "should_label=false" >> "$GITHUB_OUTPUT"
+            echo "No release branches found, skipping."
             exit 0
           fi
 
@@ -44,51 +48,36 @@ jobs:
 
           tags=$(gh api "repos/${repo}/releases" --paginate --jq '.[].tag_name')
           if echo "$tags" | grep -Fxq "$release_tag"; then
-            echo "should_label=false" >> "$GITHUB_OUTPUT"
+            echo "Release $release_tag already published, skipping."
             exit 0
           fi
 
           label="require backport/v${version}"
-          echo "should_label=true" >> "$GITHUB_OUTPUT"
-          echo "backport_label=$label" >> "$GITHUB_OUTPUT"
-
           pr_labels=$(gh pr view "$pr_number" --repo "$repo" --json labels --jq '.labels[].name' || echo "")
-          pr_labels_csv=$(echo "$pr_labels" | tr '\n' ',' | sed 's/,$//')
-          echo "pr_labels=$pr_labels_csv" >> "$GITHUB_OUTPUT"
 
-      - name: Add label if needed
-        if: steps.fetch_info.outputs.should_label == 'true' && !contains(steps.fetch_info.outputs.pr_labels, steps.fetch_info.outputs.backport_label)
+          if echo "$pr_labels" | grep -Fxq "$label"; then
+            echo "Label '$label' already present, skipping."
+            exit 0
+          fi
+
+          echo "Adding label: $label"
+          gh pr edit "$pr_number" --repo "$repo" --add-label "$label"
+
+      - name: Add backport label (release branch PRs opened by Mergify)
+        if: startsWith(env.PR_BASE_REF, 'release-harvester-v')
         env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ github.token }}
         run: |
-          echo "Adding label: ${{ steps.fetch_info.outputs.backport_label }}"
-          gh pr edit ${{ github.event.pull_request.number }} \
-            --repo ${{ github.repository }} \
-            --add-label "${{ steps.fetch_info.outputs.backport_label }}"
+          set -euo pipefail
 
-  add-backport-label:
-    if: github.event.pull_request.draft == false &&
-        startsWith(github.event.pull_request.base.ref, 'release-harvester-v')
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check conditions for backport label
-        id: check
-        run: |
-          IS_MERGIFY=$(echo '${{ github.event.pull_request.user.login }}' | grep -iq 'mergify' && echo true || echo false)
-          TARGET_BRANCH=${{ github.event.pull_request.base.ref }}
+          IS_MERGIFY=$(echo "$PR_USER_LOGIN" | grep -iq 'mergify' && echo true || echo false)
 
-          echo "IS_MERGIFY=$IS_MERGIFY" >> $GITHUB_OUTPUT
-          echo "TARGET_BRANCH=$TARGET_BRANCH" >> $GITHUB_OUTPUT
+          if [[ "$IS_MERGIFY" != "true" ]]; then
+            echo "PR author is not Mergify, skipping."
+            exit 0
+          fi
 
-      - name: Add label if needed
-        if: steps.check.outputs.IS_MERGIFY == 'true' && startsWith(steps.check.outputs.TARGET_BRANCH, 'release-harvester-v')
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          TARGET_BRANCH="${{ steps.check.outputs.TARGET_BRANCH }}"
-          version="${TARGET_BRANCH#release-harvester-v}"
+          version="${PR_BASE_REF#release-harvester-v}"
           label="backport/v${version}"
-          echo "Adding label $label"
-          gh pr edit ${{ github.event.pull_request.number }} \
-            --repo ${{ github.repository }} \
-            --add-label "$label"
+          echo "Adding label: $label"
+          gh pr edit "$PR_NUMBER" --repo "${{ github.repository }}" --add-label "$label"