build: add back docker push

.github/workflows/docker-release.yml

@@ -0,0 +1,38 @@
+---
+name: Docker Build and Push
+
+on:
+  push:
+    tags:
+      - "v*"
+jobs:
+  multi:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Dump GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "$GITHUB_CONTEXT"
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to Docker Registry
+        uses: docker/login-action@v1
+        with:
+          username: thauck
+          password: ${{ secrets.DOCKERHUB_KEY }}
+      - name: Set env
+        run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/386,linux/amd64,linux/arm64
+          push: true
+          tags: |
+            thauck/brrrr:latest
+            thauck/brrrr:${{ env.VERSION }}