Add gha workflow to publish to quay (#5)

.github/workflows/build-docker.yml

@@ -0,0 +1,39 @@
+name: Docker Multi-Architecture Build
+
+on:
+    push:
+        paths-ignore:
+            - "**.md"
+        branches:
+            - main
+
+jobs:
+    build-docker:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - name: Set up QEMU
+              uses: docker/setup-qemu-action@v3
+              with:
+                  platforms: all
+            - name: Set up Docker Buildx
+              id: buildx
+              uses: docker/setup-buildx-action@v3
+              with:
+                  version: latest
+            - name: Login to Quay.io
+              uses: docker/login-action@v3
+              with:
+                  registry: quay.io
+                  username: ${{ secrets.QUAY_USERNAME }}
+                  password: ${{ secrets.QUAY_PASSWORD }}
+            - name: Build and push
+              uses: docker/build-push-action@v5
+              with:
+                  context: .
+                  file: ./Dockerfile
+                  platforms: linux/amd64,linux/arm64/v8
+                  push: true
+                  tags: quay.io/invidious/smart-ipv6-rotator:latest
+                  cache-from: type=gha
+                  cache-to: type=gha,mode=max