Revert "chore(ci): merge jobs in issue-labels.yml in one workflow" (#6178)

This is a clean revert of the commits that led to grouping all jobs related to issue labeling into one workflow. The assumption that it would be more efficient was incorrect because it assumed the conditions for running each job would be evaluated statically Forgejo side. In reality the conditions are evaluated by the runner and multiplies the number of runs required instead of decreasing them. In turn, this clutters the status line of each pull request with numerous skipped runs. Finally it is more complex to maintain multiple jobs into a single workflow because the conditions for it to run have to be duplicated.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6178
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

.forgejo/workflows/merge-requirements.yml

@@ -0,0 +1,45 @@
+# Copyright 2024 The Forgejo Authors
+# SPDX-License-Identifier: MIT
+
+name: requirements
+
+on:
+  pull_request:
+    types:
+      - labeled
+      - edited
+      - opened
+      - synchronize
+
+jobs:
+  merge-conditions:
+    if: vars.ROLE == 'forgejo-coding'
+    runs-on: docker
+    container:
+      image: 'code.forgejo.org/oci/node:20-bookworm'
+    steps:
+      - name: Debug output
+        run: |
+          cat <<'EOF'
+          ${{ toJSON(github.event) }}
+          EOF
+      - name: Missing test label
+        if: >
+          !(
+            contains(toJSON(github.event.pull_request.labels), 'test/present')
+            || contains(toJSON(github.event.pull_request.labels), 'test/not-needed')
+            || contains(toJSON(github.event.pull_request.labels), 'test/manual')
+          )
+        run: |
+          echo "Test label must be set to either 'present', 'not-needed' or 'manual'."
+          exit 1
+      - name: Missing manual test instructions
+        if: >
+          (
+            contains(toJSON(github.event.pull_request.labels), 'test/manual')
+            && !contains(toJSON(github.event.pull_request.body), '# Test')
+          )
+        run: |
+          echo "Manual test label is set. The PR description needs to contain test steps introduced by a heading like:"
+          echo "# Testing"
+          exit 1