repository, not registry

Author: euanh

.github/workflows/pull_request.yml

@@ -65,7 +65,7 @@ jobs:
                   cd plugin-sdk
                   swift package init --type executable
                   swift package add-dependency https://github.com/apple/swift-container-plugin --from 0.2.0
-                  swift package --swift-sdk x86_64-swift-linux-musl --allow-network-connections all build-container-image --registry localhost:5000/test-static-stdlib
+                  swift package --swift-sdk x86_64-swift-linux-musl --allow-network-connections all build-container-image --repository localhost:5000/test-static-stdlib
 
             - name: Build the example
               run: |