add GitHub Actions workflow for building and pushing Docker images

.gitea/workflows/build.yml

@@ -0,0 +1,41 @@
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Tag to build and push'
+        required: false
+        default: 'latest'
+  push:
+    tags:
+      - "v*"
+
+name: 🏗️✨ Build Workflow
+
+jobs:
+  Build:
+    name: 🖥️ 🔨 Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: 📖 🔍 Checkout Repository Code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: 🔑 🔐 Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: 🏗️ 🔧 Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: 🐳 🔨 Build Container
+        uses: docker/build-push-action@v6
+        with:
+          sbom: true
+          provenance: true
+          platforms: linux/arm64,linux/amd64
+          context: .
+          dockerfile: Dockerfile
+          tags: siteworxpro/gun-manager:${{ gitea.ref_name }}