Create docker build actions

.github/workflows/main.yml

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+ This is a basic workflow to help you get started with Actions
+
+name: Docker Builds
+
+# Controls when the workflow will run
+on:
+  workflow_dispatch:
+  push:
+
+permissions: 
+  contents: read
+  packages: write
+  
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      # Get the repositery's code
+      - name: Checkout
+        uses: actions/checkout@v2
+      
+      # https://github.com/docker/setup-qemu-action
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm/v7, linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}