feat: add Dockerfile & Github workflow

.github/workflows/multiarch_dockerhub.yml

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+name: Build and Push Multiarch Docker image for Dockerhub
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Prepare
+        id: prep
+        run: |
+          DOCKER_IMAGE=${{ secrets.DOCKER_USERNAME }}/fluidd
+          VERSION=latest
+          SHORTREF=${GITHUB_SHA::8}
+
+          # If this is git tag, use the tag name as a docker tag
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
+          fi
+          TAGS="${DOCKER_IMAGE}:${VERSION}"
+
+          # If the VERSION looks like a version number, assume that
+          # this is the most recent version of the image and also
+          # tag it 'latest'.
+          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
+          fi
+
+          # Set output parameters.
+          echo ::set-output name=tags::${TAGS}
+          echo ::set-output name=docker_image::${DOCKER_IMAGE}
+          echo ::set-output name=git_tag::${VERSION}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@master
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@master
+
+      - name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build
+        uses: docker/build-push-action@v2
+        with:
+          builder: ${{ steps.buildx.outputs.name }}
+          context: docs/docker
+          file: docs/docker/Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          push: true
+          tags: ${{ steps.prep.outputs.tags }}
+          build-args: |
+            FRONTEND_ZIP_URL=https://github.com/cadriel/fluidd/releases/${{ steps.prep.outputs.git_tag }}/download/fluidd.zip

docs/docker/Dockerfile

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+FROM debian as unzip
+
+ARG FRONTEND_ZIP_URL=https://github.com/cadriel/fluidd/releases/latest/download/fluidd.zip
+
+ARG DEBIAN_FRONTEND=noninteractive
+WORKDIR /frontend
+
+ADD ${FRONTEND_ZIP_URL} /tmp/frontend.zip
+RUN apt-get update && apt-get install -y unzip
+RUN unzip /tmp/frontend.zip -d /frontend
+
+FROM nginx:alpine as image
+
+ENV JPEG_STREAM_HOST localhost
+ENV JPEG_STREAM_PORT 8080
+
+ADD --chown=101:101 common_vars.conf /etc/nginx/conf.d/common_vars.conf 
+COPY --chown=101:101 upstreams.conf.template /etc/nginx/templates/upstreams.conf.template
+COPY --chown=101:101 client.conf /etc/nginx/conf.d/default.conf 
+COPY --from=unzip --chown=101:101 /frontend /usr/share/nginx/html
+EXPOSE 80

docs/docker/client.conf

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+server {
+    listen 80 default_server;
+    listen [::]:80 default_server;
+
+    access_log /var/log/nginx/access.log;
+    error_log /var/log/nginx/error.log;
+
+    # disable this section on smaller hardware like a pi zero
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_proxied expired no-cache no-store private auth;
+    gzip_comp_level 4;
+    gzip_buffers 16 8k;
+    gzip_http_version 1.1;
+    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/json application/xml;
+
+    # web_path from fluidd static files
+    root /usr/share/nginx/html;
+
+    index index.html;
+    server_name _;
+
+    # max upload size for gcode files
+    client_max_body_size 500M;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location = /index.html {
+        add_header Cache-Control "no-store, no-cache, must-revalidate";
+    }
+
+    location /webcam/ {
+        proxy_pass http://mjpgstreamer/;
+    }
+}

docs/docker/common_vars.conf

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+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    '' close;
+}

docs/docker/upstreams.conf.template

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+upstream mjpgstreamer {
+    ip_hash;
+    server ${JPEG_STREAM_HOST}:${JPEG_STREAM_PORT};
+}