chore(ci): merge jobs in issue-labels.yml in one workflow

Fixes: forgejo/forgejo#5999

.forgejo/workflows/issue-labels.yml

@@ -1,14 +1,52 @@
 # Copyright 2024 The Forgejo Authors
 # SPDX-License-Identifier: MIT
 #
+# To modify the pull_request_target jobs:
+#
+#  - push it to the wip-ci-issue-labels branch on the forgejo repository
+#    otherwise it will not have access to the required secrets.
+#
+#  - once it works, open a pull request for the sake of keeping track
+#    of the change even if the PR won't run it because it will use
+#    whatever is in the default branch instead
+#
+#  - after it is merged, double check it works by changing the labels
+#    to trigger the job.
+#
 name: issue-labels
 
 on:
+  push:
+    branches:
+      - 'wip-ci-issue-labels'
+
   pull_request_target:
     types:
+      - closed
+      - edited
       - labeled
+      - synchronize
+
+  pull_request:
+    types:
+      - edited
+      - labeled
+      - opened
+      - synchronize
 
 jobs:
+  info:
+    if: vars.ROLE == 'forgejo-coding'
+    runs-on: docker
+    container:
+      image: code.forgejo.org/oci/node:20-bookworm
+    steps:
+      - name: Debug info
+        run: |
+          cat <<'EOF'
+          ${{ toJSON(github) }}
+          EOF
+
   end-to-end:
     if: >
       vars.ROLE == 'forgejo-coding' &&
@@ -51,18 +89,7 @@ jobs:
           destination-token: ${{ secrets.END_TO_END_CASCADING_PR_DESTINATION }}
           close-merge: true
           update: .forgejo/cascading-pr-end-to-end
-# Copyright 2024 The Forgejo Authors
-# SPDX-License-Identifier: MIT
-#
-name: issue-labels
 
-on:
-  pull_request_target:
-    types:
-      - closed
-      - labeled
-
-jobs:
   backporting:
     if: >
       vars.ROLE == 'forgejo-coding' &&
@@ -95,19 +122,7 @@ jobs:
           enable-err-notification: true
           git-user: forgejo-backport-action
           git-email: forgejo-backport-action@noreply.codeberg.org
-# Copyright 2024 The Forgejo Authors
-# SPDX-License-Identifier: MIT
 
-name: issue-labels
-
-on:
-  pull_request:
-    types:
-      - labeled
-      - edited
-      - opened
-
-jobs:
   merge-conditions:
     if: >
       vars.ROLE == 'forgejo-coding' &&
@@ -147,16 +162,7 @@ jobs:
           echo "Manual test label is set. The PR description needs to contain test steps introduced by a heading like:"
           echo "# Testing"
           exit 1
-name: issue-labels
 
-on:
-  pull_request_target:
-    types:
-      - edited
-      - synchronize
-      - labeled
-
-jobs:
   release-notes:
     if: >
       vars.ROLE == 'forgejo-coding' &&