added back script which is in use

hack/await_image.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# standard bash error handling
+set -o nounset  # treat unset variables as an error and exit immediately.
+set -o errexit  # exit immediately when a command fails.
+set -E          # must be set if you want the ERR trap
+set -o pipefail # prevents errors in a pipeline from being masked
+
+# Expected variables:
+#             IMAGE_REPO - binary image repository
+#             GITHUB_TOKEN - github token
+#             TRIGGER - event which triggered the workflow, for PRs it is the commit SHA, for push events it is the GITHUB_REF
+#             QUERY_INTERVAL - time to wait between queries in seconds
+
+PROTOCOL=docker://
+
+# timeout after 15 minutes
+TIMEOUT=900
+START_TIME=$SECONDS
+
+until $(skopeo list-tags ${PROTOCOL}${IMAGE_REPO} | jq '.Tags|any(. == env.TRIGGER)'); do
+  if (( SECONDS - START_TIME > TIMEOUT )); then
+    echo "Timeout reached: ${IMAGE_REPO}:${TRIGGER} not found within $(( TIMEOUT/60 )) minutes"
+    exit 1
+  fi
+  echo "Waiting for binary image: ${IMAGE_REPO}:${TRIGGER}"
+  echo "Trigger: $TRIGGER"
+  sleep "$QUERY_INTERVAL"
+done
+
+echo "Binary image: ${IMAGE_REPO}:${TRIGGER} available"