Dockerfiles: reduce image size (#12702)

Dockerfile

@@ -31,7 +31,8 @@ RUN groupadd --gid ${GID} ${USER} \
 
 USER ${USER}
 
-RUN npm install --omit=dev
+RUN npm install --omit=dev \
+    && rm -rf .npm
     # TODO: generate lockfiles for each package manager
     ## pnpm import \
 

dev.Dockerfile

@@ -38,8 +38,9 @@ COPY --from=git --chown=${USER}:${USER} /usr/src/app/install/package.json /usr/s
 
 USER ${USER}
 
-RUN npm install
-  
+RUN npm install \
+    && rm -rf .npm
+
 FROM node:lts-slim AS final
 
 ENV NODE_ENV=development \