Fixup unpublish step

bin/unpublish-temp-tags.sh

@@ -3,19 +3,27 @@
 set -euo pipefail
 set -x
 
+dockerhub_token=$(curl -s -f -H "Content-Type: application/json" -X POST -d "{\"username\": \"${DOCKER_HUB_USERNAME}\", \"password\": \"${DOCKER_HUB_TOKEN}\"}" https://hub.docker.com/v2/users/login/ | jq -r .token)
+
 unpublish_group() {
-    local tagBase="$1"
+    local stackVersion="$1"
     local targetTagSuffix="$2"
     variants=("" "-build")
-    if (( STACK_VERSION <= 22 )); then
+    if (( stackVersion <= 22 )); then
         variants+=("-cnb" "-cnb-build")
     fi
     for variant in "${variants[@]}"; do
-      hub-tool tag rm "${tagBase}${variant}${targetTagSuffix}"
+      echo "Deleting heroku/heroku:${stackVersion}${variant}${targetTagSuffix}"
+      code=$(curl -s -f -X DELETE -H "Authorization: JWT ${dockerhub_token}" --write-out "%{http_code}"
+      "https://hub.docker.com/v2/repositories/heroku/heroku/tags/${stackVersion}${variant}${targetTagSuffix}/")
+
+      if (( code != 404 )) || (( code != 200 )) || (( code != 201 )); then
+          echo "Couldn't delete heroku/heroku:${stackVersion}${variant}${targetTagSuffix}: ${code}"
+      fi
     done
 }
 
-publicTag="heroku/heroku:${STACK_VERSION}"
-tempTagSuffix=".temp_${GITHUB_RUN_ID}"
-
-unpublish_group "${publicTag}" "${tempTagSuffix}"
+stackVersion="${1:-$STACK_VERSION}"
+tempTagSuffix="${2:-".temp_$GITHUB_RUN_ID"}"
+# delete each tag in a group on Docker Hub.
+unpublish_group "${stackVersion}" "${tempTagSuffix}"