Add GitHub workflow for publishing to Docker Hub

.github/workflows/publish.yml

@@ -0,0 +1,42 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - "[0-9]+.[0-9]+.[0-9]+"
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v1
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Get metadata for Docker image
+      id: docker-metadata
+      uses: docker/metadata-action@v3
+      with:
+        images: jordanpotter/wireguard
+        tags: |
+          type=semver,pattern={{version}}
+
+    - name: Log into Docker Hub
+      uses: docker/login-action@v1 
+      with:
+        username: jordanpotter
+        password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v2
+      with:
+        tags: ${{ steps.docker-metadata.outputs.tags }}
+        labels: ${{ steps.docker-metadata.outputs.labels }}
+        platforms: linux/amd64,linux/arm64
+        push: true