Add workflow to build patched image to ghcr.io/rinseaid/newt:patched

Former-commit-id: b6e2d61a18

.github/workflows/build-patched.yml

@@ -0,0 +1,34 @@
+name: Build patched image
+
+on:
+  push:
+    branches: [fix/x-forwarded-proto-tls]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: docker/setup-qemu-action@v3
+
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          build-args: VERSION=patched
+          tags: ghcr.io/rinseaid/newt:patched