ci(e2e): compile-check tests with 'go test -c' not 'go build'

./e2e is a test-only package, so 'go build ./e2e' fails with 'no non-test
Go files' (exit 1 under bash -e). 'go test -c -o /dev/null' compiles the
test binary without running it — the correct build check.

Author: moshloop

.github/workflows/e2e.yml

@@ -66,7 +66,7 @@ jobs:
 
       - name: Build e2e tests
         run: |
-          go build -v ./e2e
+          go test -c -o /dev/null ./e2e
         env:
           CGO_ENABLED: 1