fix: exclude microservices_architecture from Linux CI builds

The microservices architecture example tries to pull from external OCI
registries (ghcr.io/iot/devices/registry) that either don't exist or
require authentication, causing 'Not authorized' errors.

Exclude it from Linux CI builds (already excluded on macOS) to prevent
build failures while preserving the example for manual testing.

Author: avrabe

.github/workflows/ci.yml

@@ -108,6 +108,7 @@ jobs:
             -//examples/wkg_integration/... \
             -//examples/wizer_example/... \
             -//examples/simple_oci_test/... \
+            -//examples/microservices_architecture/... \
             -//test_wac/... \
             -//test/wkg/... \
             -//test/production/... \