ci: add an all-checks job to require in the ruleset

Author: azmeuk

.github/workflows/tests.yaml

@@ -70,3 +70,15 @@ jobs:
       with:
         persist-credentials: false
     - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
+
+  all-checks:
+    if: always()
+    needs: [tests, minversions, style]
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Fail if a needed job did not succeed
+        if: >-
+          contains(needs.*.result, 'failure')
+          || contains(needs.*.result, 'cancelled')
+          || contains(needs.*.result, 'skipped')
+        run: exit 1