Revert "update m2 volume path"

This reverts commit 44205c44.

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:/build/.m2/ portal-backend-builder:latest
+    - docker run --rm -v $WORKSPACE:/build/ -v $HOME/.m2:/home/build/.m2/ portal-backend-builder:latest
     - echo "Finished building project"
 
 portal-backend: