Add packager helper script

app-version.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# Usage: ./app-version.sh <image> <service>
+# Example: ./app-version.sh drone/drone:1.10.1 app
+#
+# Accepts a full format hub.docker.com image tag which it pulls locally and
+# generates output which can be used to put in the abra.sh for app packaging.
+# Requires the yq program https://mikefarah.gitbook.io/yq/
+
+error() {
+  echo "$(tput setaf 1)ERROR: $*$(tput sgr0)"
+  exit 1
+}
+
+IMAGE="$1"
+SERVICE="$2"
+
+if ! docker pull -q "$IMAGE" > /dev/null 2>&1; then
+	error "Failed to download image, is the tag correct?"
+fi
+
+version=$(echo "$IMAGE" | cut -d ':' -f2)
+digest=$(docker image inspect -f "{{.Id}}" "$IMAGE" | cut -d ':' -f2- | cut -c 1-8)
+
+echo "ABRA_TYPE_${SERVICE^^}_VERSION=${version}"
+echo "ABRA_TYPE_${SERVICE^^}_DIGEST=${digest}"