RM-6428 Add script to handle tagging with the image digest.

scripts/pushDockerDigestTag.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+scriptName=`basename "$0"`
+
+if [ "$#" -ne 2 ]; then
+    echo "Usage: ${scriptName} <imageName> <existingTag>"
+    exit 1
+fi
+
+echo "${scriptName} called with:"
+image=$1
+echo "  image: $image"
+existingTag=$2
+echo "  existingTag: $existingTag"
+
+DIGEST_LENGTH=12
+
+# Note that this command should work even if the image is already present locally.
+digest=`docker pull ${image}:${existingTag} | grep "Digest:" | awk -F':' '{print $3}' | cut -c 1-$DIGEST_LENGTH`
+
+if [ ${#digest} != $DIGEST_LENGTH ]
+then
+    echo "Unexpected length for digest: '$digest'"
+    exit 1
+fi
+
+newTag=${existingTag}_${digest}
+docker tag ${image}:${existingTag} ${image}:${newTag}
+docker push ${image}:${newTag}
+
+echo "Pushed ${image}:${existingTag} to ${image}:${newTag}"