stage dockerfile

.github/workflows/on-tag.yml

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+name: Automatically Build image on tag
+env:
+        DOCKER_CLI_EXPERIMENTAL: enabled
+        TAG_FMT: '^refs/tags/(((.?[0-9]+){3,4}))$'
+
+on:
+        push:
+                tags: [ '*' ]
+
+jobs:
+        build:
+                runs-on: ubuntu-18.04
+                name: Build / Push Umbrel Dashboard on version tag
+                steps:
+                        - name: Setup Environment
+                          run: |
+                                  if ! echo "$GITHUB_REF" | grep -qE "$TAG_FMT"; then
+                                        echo "ERR: TAG must be in format: vX.Y.Z or X.Y.Z or vW.X.Y.Z or W.X.Y.Z"
+                                        exit 1
+                                  fi
+                                  VERSION="$(echo "$GITHUB_REF" | sed -E "s|$TAG_FMT|\2|")"
+                                  
+                                  TAG="$(echo "$GITHUB_REF" | sed -E "s|$TAG_FMT|\1|")"
+                                  echo ::set-env name=TAG::"$TAG"
+                                  
+                        - name: Show set environment variables
+                          run: |
+                                  printf "    TAG: %s\n"  "$TAG"                                  
+                        - name: Login to Docker for building
+                          run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+                        - name: Checkout project
+                          uses: actions/checkout@v2
+                        - name: Setup Docker buildx Action
+                          uses: crazy-max/ghaction-docker-buildx@v1
+                          id: buildx
+                          with:
+                                  buildx-version: latest
+                                  qemu-version: latest
+                        - name: Available platforms
+                          run: echo ${{ steps.buildx.outputs.platforms }}
+                        - name: Run Docker build X (against tag)
+                          run: |
+                                  docker buildx build \
+                                  --platform linux/amd64,linux/386,linux/arm/v7,linux/arm64 \
+                                  -t getumbrel/manager:$TAG \
+                                  --output "type=registry" \
+                                  .
+                        - name: Run Docker build X (against latest)
+                          run: |
+                                  docker buildx build \
+                                  --platform linux/amd64,linux/386,linux/arm/v7,linux/arm64 \
+                                  -t getumbrel/manager:latest \
+                                  --output "type=registry" \
+                                  .
+                        - name: Run Docker buildx (against stage)
+                          run: |
+                                docker buildx build \
+                                --platform linux/amd64 \
+                                -f ./Dockerfile.stage \
+                                -t getumbrel/manager:stage \
+                                --output "type=registry" \
+                                .

Dockerfile.stage

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+FROM node:12.16.3-alpine
+
+# install simple http server for serving static content
+RUN yarn global add http-server
+
+# make the 'app' folder the current working directory
+WORKDIR /app
+
+# copy 'package.json'
+COPY package.json ./
+
+# copy 'yarn.lock'
+COPY yarn.lock ./
+
+# install dependencies
+RUN yarn
+
+# copy project files and folders to the current working directory (i.e. 'app' folder)
+COPY . .
+
+# Set staging env variable if building for testnet.getumbrel.com
+ENV STAGING_DEPLOYMENT=true
+
+# build app for production
+RUN yarn build
+
+# copy index.html to 404.html as http-server serves 404.html on all non "/" routes
+RUN cp ./dist/index.html ./dist/404.html
+
+EXPOSE 3004
+CMD [ "http-server", "-p 3004", "dist" ]