Added CI Docker image builder

.github/workflows/docker.yml

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+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out the repo
+      uses: actions/checkout@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@v3
+      with:
+        images: ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}
+        tags: type=raw,value=latest
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        file: Dockerfile
+        push: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM nginx:alpine
+
+#  Install app
+COPY ./nginx/nginx.conf /etc/nginx/nginx.conf
+COPY ./src /usr/share/nginx/html

nginx/nginx.conf

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+user  nginx;
+worker_processes  4;
+
+error_log  /dev/stderr warn;
+pid        /var/run/nginx.pid;
+
+events {
+    worker_connections  128;
+}
+
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    sendfile       on;
+    tcp_nopush     on;
+
+    keepalive_timeout  65;
+
+    # Fix for https://stackoverflow.com/a/27551259
+    proxy_buffer_size   128k;
+    proxy_buffers   4 256k;
+    proxy_busy_buffers_size   256k;
+
+    server {
+        listen 80 default_server;
+        access_log /dev/stdout main;
+
+        location / {
+            root /usr/share/nginx/html;
+            index index.html;
+        }
+    }
+}