Docker image nightly builds (#48)

Author: dvolodin7

.github/workflows/docker-master.yml

@@ -0,0 +1,30 @@
+name: Nightly Docker Build
+on:
+  schedule:
+    - cron: "0 3 * * *"
+  workflow_dispatch: # allows manual trigger
+permissions:
+  contents: read
+  packages: write
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push multi-platform image
+        run: |
+          docker buildx build \
+            --platform linux/amd64,linux/arm64 \
+            --push \
+            -t ghcr.io/gufolabs/noc:master \
+            --target code \
+            .