Merge branch 'feat-pkr-build-error-handling' into 'master'

Option to handle build instance after provisioner failure

See merge request !40

.gitlab-ci.yml

@@ -68,7 +68,7 @@ build_packer:
     - echo $PKR_VAR_s3_endpoint
     - packer init xdmod
     - packer validate xdmod
-    - packer build -machine-readable xdmod
+    - packer build -machine-readable -on-error=${on_error} xdmod
 
 clean_up:   # This job removes older built images
   stage: clean    # It only starts when the job in the build stage completes successfully.