Add action to verify devcontainer base

.github/workflows/verify-devcontainer-base.yml

@@ -0,0 +1,15 @@
+---
+name: Verify make cross in devcontainer base
+on:
+  workflow_dispatch: null
+jobs:
+  publish_release:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Run devcontainer build using Podman
+        run: |
+          podman build -t devcontainer -f .devcontainer/Containerfile .
+      - name: Run `make cross` against devcontainer
+        run: >
+          podman run devcontainer \
+            sh -c "git clone https://github.com/crc-org/crc --depth 1 && cd crc && make cross"