probe round 4: does Gitea evaluate an expression in runs-on

.github/workflows/validate-charts.yml

@@ -244,7 +244,7 @@ jobs:
     # github.com the job therefore stays queued - that is the intended state
     # for the window in which CI is being handed over, and it is the reason
     # this line must not be "corrected" back to ubuntu-latest.
-    runs-on: ubuntu-docker
+    runs-on: ${{ github.server_url == 'https://github.com' && 'ubuntu-latest' || 'ubuntu-docker' }}
     # Blocking since Renovate automerges patch/minor updates: a chart that no
     # longer starts must stop the PR before it reaches main and publishes. This
     # ends the stabilization phase of issue #22 - the job reported failures
@@ -335,7 +335,7 @@ jobs:
       - name: "Install k3d"
         run: curl -sSfL https://raw.githubusercontent.com/k3d-io/k3d/main/install.sh | TAG="$K3D_VERSION" bash
       - name: "Create k3d cluster"
-        run: k3d cluster create install-test --image "$K3S_IMAGE" --wait --timeout 180s --no-rollback
+        run: k3d cluster create install-test --image "$K3S_IMAGE" --wait --timeout 180s
       - name: "PROBE why did k3s not come up (remove before merge)"
         if: failure()
         run: |