fix(ci): improve script formatting and echo image tag in build process

.gitlab-ci.yml

@@ -27,18 +27,17 @@ workflow:
   script:
     - set -eo pipefail
     - echo "DEBUG----- $(date '+%Y-%m-%d %H:%M:%S') Starting build process"
-    - >
+    - |
       if [ -n "$CI_COMMIT_TAG" ]; then
-        IMAGE_TAG="${CI_COMMIT_TAG#sub2api/}";
+        echo "IMAGE_TAG=${CI_COMMIT_TAG#sub2api/}"
       else
-        IMAGE_TAG="${CI_COMMIT_REF_NAME}";
+        echo "IMAGE_TAG=$CI_COMMIT_REF_NAME"
       fi
-    - echo "Image tag: $IMAGE_TAG"
     - echo "Logging into Harbor..."
     - echo "$HARBOR_PASSWORD" | docker login -u "$HARBOR_USERNAME" --password-stdin "$HARBOR_SERVICE"
-    - docker build -f Dockerfile --build-arg VERSION="${VERSION}" --build-arg COMMIT="${COMMIT}" --build-arg DATE="${DATE}" -t "$HARBOR_SERVICE/$HARBOR_REGISTRY/sub2api:$IMAGE_TAG" .
-    - docker push "$HARBOR_SERVICE/$HARBOR_REGISTRY/sub2api:$IMAGE_TAG"
-    - docker rmi "$HARBOR_SERVICE/$HARBOR_REGISTRY/sub2api:$IMAGE_TAG" || true
+    - docker build -f Dockerfile --build-arg VERSION="${VERSION}" --build-arg COMMIT="${COMMIT}" --build-arg DATE="${DATE}" -t "$HARBOR_SERVICE/$HARBOR_REGISTRY/sub2api:${IMAGE_TAG}" .
+    - docker push "$HARBOR_SERVICE/$HARBOR_REGISTRY/sub2api:${IMAGE_TAG}"
+    - docker rmi "$HARBOR_SERVICE/$HARBOR_REGISTRY/sub2api:${IMAGE_TAG}" || true
 
 sub2api:
   stage: build