Update 2_Image_Building: Add command to update hyrax/deploy_info.json, use timestamp from hyrax/deploy_info.json for DOCKER_IMAGE_TAG

system/deployment/2_Image_Building.md

@@ -39,9 +39,10 @@ git pull
 git apply example/path/to/example_changes.patch
 ```
 
-Generate docker image tag string
+Update `hyrax/deploy_info.json` and generate docker image tag string
 ```shell
-export DOCKER_IMAGE_TAG="$(git describe --always --long --tags)_$(date --utc --iso-8601=seconds | sed 's|\+00:00$|UTC|g;s|:|-|g')"
+./hyrax/deploy_info.sh
+export DOCKER_IMAGE_TAG="$(git describe --always --long --tags)_$(jq -r '.last_deployed' < hyrax/deploy_info.json | sed 's|\+00:00$|UTC|g;s|:|-|g')"
 
 # Check the docker image tag
 echo "${DOCKER_IMAGE_TAG}"