tools: Put sha1 in container tag instead of name

Ideally instead of having names like ruby_jessie_x64_ruby_2_5 and
ruby_jessie_x64_ruby_2_6 they would have the name "ruby" with tags
containing jessie_x64_ruby_2_5/6. But fixing that would be much more
invasive. The sha1 in the tag is producing the worst effects, so this is
a case of the perfect being the enemy of the good.

Fixes #20546

tools/dockerfile/push_testing_images.sh

@@ -36,14 +36,15 @@ do
   # contents of the docker image always changes the SHA (e.g. using "ADD file" 
   # cmd in the dockerfile in not ok as contents of the added file will not be
   # reflected in the SHA).
-  DOCKER_IMAGE_NAME=$(basename $DOCKERFILE_DIR)_$(sha1sum $DOCKERFILE_DIR/Dockerfile | cut -f1 -d\ )
+  DOCKER_IMAGE_NAME=$(basename $DOCKERFILE_DIR)
+  DOCKER_IMAGE_TAG=$(sha1sum $DOCKERFILE_DIR/Dockerfile | cut -f1 -d\ )
 
   # skip the image if it already exists in the repo 
-  curl --silent -f -lSL https://registry.hub.docker.com/v2/repositories/${DOCKERHUB_ORGANIZATION}/${DOCKER_IMAGE_NAME}/tags/latest > /dev/null \
+  curl --silent -f -lSL https://registry.hub.docker.com/v2/repositories/${DOCKERHUB_ORGANIZATION}/${DOCKER_IMAGE_NAME}/tags/${DOCKER_IMAGE_TAG} > /dev/null \
       && continue
 
-  docker build -t ${DOCKERHUB_ORGANIZATION}/${DOCKER_IMAGE_NAME} ${DOCKERFILE_DIR}
+  docker build -t ${DOCKERHUB_ORGANIZATION}/${DOCKER_IMAGE_NAME}:${DOCKER_IMAGE_TAG} ${DOCKERFILE_DIR}
 
   # "docker login" needs to be run in advance
-  docker push ${DOCKERHUB_ORGANIZATION}/${DOCKER_IMAGE_NAME}
+  docker push ${DOCKERHUB_ORGANIZATION}/${DOCKER_IMAGE_NAME}:${DOCKER_IMAGE_TAG}
 done

tools/run_tests/dockerize/build_and_run_docker.sh

@@ -33,7 +33,7 @@ cd -
 # $@ - Extra args to pass to docker run
 
 # Use image name based on Dockerfile location checksum
-DOCKER_IMAGE_NAME=$(basename "$DOCKERFILE_DIR")_$(sha1sum "$DOCKERFILE_DIR/Dockerfile" | cut -f1 -d\ )
+DOCKER_IMAGE_NAME=$(basename "$DOCKERFILE_DIR"):$(sha1sum "$DOCKERFILE_DIR/Dockerfile" | cut -f1 -d\ )
 
 # Pull the base image to force an update
 if [ "$DOCKER_BASE_IMAGE" != "" ]

tools/run_tests/dockerize/build_docker_and_run_tests.sh

@@ -30,7 +30,7 @@ cd -
 # DOCKERHUB_ORGANIZATION - If set, pull a prebuilt image from given dockerhub org.
 
 # Use image name based on Dockerfile location checksum
-DOCKER_IMAGE_NAME=$(basename "$DOCKERFILE_DIR")_$(sha1sum "$DOCKERFILE_DIR/Dockerfile" | cut -f1 -d\ )
+DOCKER_IMAGE_NAME=$(basename "$DOCKERFILE_DIR"):$(sha1sum "$DOCKERFILE_DIR/Dockerfile" | cut -f1 -d\ )
 
 if [ "$DOCKERHUB_ORGANIZATION" != "" ]
 then

tools/run_tests/dockerize/build_interop_image.sh

@@ -84,9 +84,9 @@ fi
 # on OSX use md5 instead of sha1sum
 if command -v sha1sum > /dev/null;
 then
-  BASE_IMAGE=${BASE_NAME}_$(sha1sum "tools/dockerfile/interoptest/$BASE_NAME/Dockerfile" | cut -f1 -d\ )
+  BASE_IMAGE=${BASE_NAME}:$(sha1sum "tools/dockerfile/interoptest/$BASE_NAME/Dockerfile" | cut -f1 -d\ )
 else
-  BASE_IMAGE=${BASE_NAME}_$(md5 -r "tools/dockerfile/interoptest/$BASE_NAME/Dockerfile" | cut -f1 -d\ )
+  BASE_IMAGE=${BASE_NAME}:$(md5 -r "tools/dockerfile/interoptest/$BASE_NAME/Dockerfile" | cut -f1 -d\ )
 fi
 
 if [ "$DOCKERHUB_ORGANIZATION" != "" ]