Fix Docker build

Dockerfile.builder

@@ -14,4 +14,4 @@ VOLUME /build
 # Define working directory
 WORKDIR /build
 
-CMD ["/build-in-docker.sh"]
+ENTRYPOINT ["/build-in-docker.sh"]

captain.yml

@@ -9,7 +9,7 @@ builder:
   post:
     - echo "Finished building portal backend builder image"
     - echo "Building project..."
-    - docker run --rm -v $WORKSPACE:/build/ -v $HOME/.m2:/home/build/.m2/ portal-backend-builder
+    - docker run --rm -v $WORKSPACE:/build/ -v $HOME/.m2:/home/build/.m2/ portal-backend-builder:latest
     - echo "Finished building project"
   test:
     - ./tests/test-build.sh