Use local container

Author: jdetter

.github/workflows/ci.yml

@@ -290,6 +290,15 @@ jobs:
 
   unreal_engine_tests:
     name: Unreal Engine Tests
+    container:
+      image: localhost:5000/spacetimedb-ci:latest
+      options: >-
+        --user runner
+        --network host
+        -v /var/run/docker.sock:/var/run/docker.sock
+        -v /opt/github-runner/cargo-cache:/home/runner/.cargo/registry
+        -v /opt/github-runner/cargo-git:/home/runner/.cargo/git
+
     # This can't go on e.g. ubuntu-latest because that runner runs out of disk space. ChatGPT suggested that the general solution tends to be to use
     # a custom runner.
     runs-on: spacetimedb-new-runner