Revise tests. Use docker-compose.yml where possible

test/docker_tests/configurations/mount-tests/docker-compose.mount-test.active_config_mounted.yml

@@ -1,3 +1,7 @@
+# Expected outcome: Container starts successfully with proper nginx config mount
+# - SYSTEM_SERVICES_ACTIVE_CONFIG shows as writable and mounted
+# - No configuration warnings for nginx config path
+# - Custom PORT configuration should work when nginx config is writable
 services:
   netalertx:
     network_mode: host