feat: use pnpm

Dockerfile

@@ -1,28 +1,41 @@
 # Stage 1: Build application
-FROM node:18 AS compile-image
+FROM node:18-alpine AS compile-image
 
 WORKDIR /build
 
 ARG USE_RELEASE=false
 ARG RELEASE_VERSION=main
 
-ENV YARN_CACHE_FOLDER .cache/yarn/
-COPY .  ./
-
 RUN \
   if [ $USE_RELEASE = true ]; then \
-    rm -rf dist/ && \
     wget https://dl.vikunja.io/frontend/vikunja-frontend-$RELEASE_VERSION.zip -O frontend-release.zip && \
     unzip frontend-release.zip -d dist/ && \
     exit 0; \
-  fi && \
+  fi
+
+ENV PNPM_CACHE_FOLDER .cache/pnpm/
+
+# pnpm fetch does require only lockfile
+COPY pnpm-lock.yaml ./
+
+RUN \
+  # https://pnpm.io/installation#using-corepack
+  corepack enable && \
+  corepack prepare pnpm@7.9.3 --activate && \
   # Build the frontend
-  yarn install --frozen-lockfile --network-timeout 100000 && \
-  echo '{"VERSION": "'$(git describe --tags --always --abbrev=10 | sed 's/-/+/' | sed 's/^v//' | sed 's/-g/-/')'"}' > src/version.json && \
-  yarn run build
+	pnpm fetch
+
+ADD .  ./
+
+RUN apk add --no-cache git
+
+RUN \
+	pnpm install --offline && \
+	echo '{"VERSION": "'$(git describe --tags --always --abbrev=10 | sed 's/-/+/' | sed 's/^v//' | sed 's/-g/-/')'"}' > src/version.json && \
+	pnpm run build
 
 # Stage 2: copy 
-FROM nginx
+FROM nginx:alpine
 
 COPY nginx.conf /etc/nginx/nginx.conf
 COPY run.sh /run.sh
@@ -36,4 +49,10 @@ ENV PGID 1000
 
 LABEL maintainer="maintainers@vikunja.io"
 
+RUN apk add --no-cache \
+  # for sh file
+	bash \
+	# installs usermod and groupmod
+	shadow
+
 CMD "/run.sh"