ci: re-enable conformance tests

Reverts the disable from #2007 now that the conformance client
supports the new auth scenarios.

Author: felixweinberger

.github/workflows/conformance.yml

@@ -1,10 +1,9 @@
 name: Conformance Tests
 
 on:
-  # Disabled: conformance tests are currently broken in CI
-  # push:
-  #   branches: [main]
-  # pull_request:
+  push:
+    branches: [main]
+  pull_request:
   workflow_dispatch:
 
 concurrency: