Fix grid-ui build on M1
Without this change, the sapling stage fails with an error about
missing python.
@@ -36,7 +36,7 @@ RUN git rev-parse HEAD > /commit-hash
# Sapling build stage
FROM node:14.18.1-alpine3.11 as sapling-build-stage
-RUN apk update && apk add git
+RUN apk update && apk add python g++ git make && rm -rf /var/cache/apk/*
RUN npm config set unsafe-perm true
