Increase test-integration timeout to 30 minutes

The mx check integration tests plus roundtrip tests with mx
create-project exceed the default 10-minute Go test timeout
(~11 min total). Set -timeout 30m in Makefile and workflow.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ako

.github/workflows/nightly.yml

@@ -30,6 +30,7 @@ jobs:
 
       - name: Integration tests
         run: make test-integration
+        timeout-minutes: 30
 
   nightly:
     needs: test

Makefile

@@ -134,7 +134,7 @@ test:
 
 # Run integration tests (requires mx binary / mxbuild)
 test-integration:
-	CGO_ENABLED=0 go test -tags integration ./...
+	CGO_ENABLED=0 go test -tags integration -timeout 30m ./...
 
 # Run MDL integration tests (requires Docker and a Mendix project)
 # Usage: make test-mdl MPR=path/to/app.mpr