feat: add GitHub Actions workflow for building and pushing Docker images

.github/workflows/main.yml

@@ -0,0 +1,40 @@
+name: Build and Push Docker Image
+
+on: [push]
+
+env:
+  REGISTRY_URL: gitea.kobim.cloud
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    #container:
+    #image: docker
+    #options: --privileged
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4.2.2
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3.4.0
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3.9.0
+
+      - name: Log in to Docker registry
+        uses: docker/login-action@v3.3.0
+        with:
+          registry: ${{ env.REGISTRY_URL }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6.13.0
+        with:
+          context: .
+          push: true
+          tags: ${{ env.REGISTRY_URL }}/${{ github.repository_owner }}/${{ github.event.repository.name }}:latest
+          platforms: |
+            linux/amd64
+            linux/arm64