Ensure python2 is installed for frontend build

scripts/frontend-build

@@ -5,6 +5,9 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 DOCKER_IMAGE=jc21/alpine-nginx-full:node
 
+apk update
+apk add python2
+
 # Ensure docker exists
 if hash docker 2>/dev/null; then
 	cd "${DIR}/.."