ci: recover artefact uploading

Remove artifacts uploading from the build stage. Since we use a shared
docker socket on the same runner host, the package stage can access the
locally built jar file directly without needing gitlab coordinator upload/download.

.gitlab-ci.yml

@@ -22,7 +22,6 @@ build:
   artifacts:
     paths:
       - build/libs/*.jar
-    expire_in: 30 min
   rules:
     - if: $CI_COMMIT_TAG
 
@@ -35,6 +34,7 @@ package:
     - JAR_FILE=$(find build/libs -name '*.jar' | head -1)
     - echo "Building Docker image for tag $CI_COMMIT_TAG with JAR $JAR_FILE"
     - docker build
+        --provenance=false
         -f Dockerfile.ci
         --build-arg JAR_FILE="$JAR_FILE"
         -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_TAG"