switch to pnpm

Dockerfile.artifacts

@@ -3,11 +3,15 @@ FROM node:16.15.1-alpine as build-frontend-deps
 ARG CI
 
 ENV SKIP_FRONTEND_TEST=true
+ENV CI=true
 
-RUN apk add --no-cache --update git
 ADD frontend/package.json /srv/frontend/package.json
 ADD frontend/package-lock.json /srv/frontend/package-lock.json
-RUN cd /srv/frontend && CI=true npm ci
+RUN
+	cd /srv/frontend && \
+	apk add --no-cache --update git && \
+	npm i -g pnpm && \
+	pnpm i
 
 FROM node:16.15.1-alpine as build-frontend