add rules for building

java/.gitlab-ci.yml

@@ -5,6 +5,10 @@
     - buildah bud --storage-driver=${STORAGE_DRIVER} -t ${FQ_IMAGE_NAME}:java${JAVA_VERSION} -f java/Dockerfile.java${JAVA_VERSION} .
     - echo "$CI_REGISTRY_PASSWORD" | buildah login -u "$CI_REGISTRY_USER" --password-stdin "$CI_REGISTRY"
     - buildah push ${FQ_IMAGE_NAME}:java${JAVA_VERSION}
+  rules:
+    - changes:
+        - java/**
+    - if: '$CI_PIPELINE_SOURCE == "schedule"'
 
 build_java8:
   <<: *build_template