Update Dockerfile using our image and for yarn latest usage

.gitignore

@@ -3,3 +3,4 @@ dist/
 service-worker.build.js
 .env
 static/images/mockups
+.yarn/

frontend/.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

frontend/Dockerfile

@@ -1,18 +1,20 @@
-FROM node:18 AS build
+FROM git.webdeploy.it/webdeploy/yarn AS build
 
 WORKDIR /usr
+COPY .yarnrc.yml ./
 COPY package.json ./
 COPY yarn.lock ./
-RUN yarn install --frozen-lockfile 
+RUN yarn install --immutable
 COPY . ./
 RUN yarn build
 
-FROM node:18-alpine3.16
+FROM git.webdeploy.it/webdeploy/yarn
 
 WORKDIR /app
+COPY .yarnrc.yml ./
 COPY package.json ./
 COPY yarn.lock ./
-RUN yarn install --frozen-lockfile
+RUN yarn install --immutable
 COPY --from=build /usr/build /app
 
 EXPOSE 8000