ci: Add docker-master.yml workflow.

Author: jnms-me

.github/workflows/docker-master.yml

@@ -0,0 +1,33 @@
+name: "docker: Build and push ghcr.io/zeuswpi/tap:latest"
+
+on:
+  push:
+    branches:
+      - master
+
+concurrency:
+  group: docker-master
+  cancel-in-progress: true
+
+jobs:
+  docker-master:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: Dockerfile.production
+          push: true
+          tags: |
+            ghcr.io/zeuswpi/tap:latest
+            ghcr.io/zeuswpi/tap:latest-${{ github.sha }}