build(docker): switch to multistage build image

build/Containerfile

@@ -1,5 +1,20 @@
+ARG SITE=signpost.cloud.mareshq.com
+
+FROM node:lts as builder
+
+WORKDIR /build
+
+COPY ./sites/${SITE}/package.json .
+
+RUN yarn install --frozen-lockfile
+
+COPY ./sites/${SITE} .
+
+RUN yarn build
+
+# Final image
 FROM nginx:mainline-alpine as nginx
 
-COPY ./../../build/nginx/site.conf /etc/nginx/conf.d/default.conf
+COPY ./build/nginx/site.conf /etc/nginx/conf.d/default.conf
 
-COPY ./out /var/www/html
+COPY --from=builder /build/out /var/www/html

sites/signpost.cloud.mareshq.com/.gitlab-ci.yml

@@ -11,20 +11,16 @@ variables:
 
 build:
   stage: build
-  image: sikalabs/ci-node
   before_script:
     - docker info
   script:
-    - cd sites/signpost.cloud.mareshq.com
-    - yarn install --frozen-lockfile
-    - yarn build
-    - docker build --tag $IMAGE:$IMAGE_TAG --file ./../../build/Containerfile .
+    - docker build --tag $IMAGE:$IMAGE_TAG --file ./../../build/Containerfile --build-arg SITE=signpost.cloud.mareshq.com .
     - docker push $IMAGE:$IMAGE_TAG
 
 deploy:
   stage: deploy
   script:
-    - helm upgrade --install signpost-cloud-mareshq-com ./deploy/charts/static-site --namespace internal-static-sites -f ./sites/signpost.cloud.mareshq.com/helm-values.yaml --set image.tag=${CI_COMMIT_BRANCH}-${CI_COMMIT_SHORT_SHA}
+    - helm upgrade --install signpost-cloud-mareshq-com ./deploy/charts/static-site --namespace internal-static-sites -f ./sites/signpost.cloud.mareshq.com/helm-values.yaml --set image.tag=${CI_COMMIT_BRANCH}-${CI_COMMIT_SHORT_SHA} --set image.pullSecretBase64=$REGISTRY_PULL_SECRET_BASE64
   rules:
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   environment: