Add weekly build workflow for Docker image deployment

.github/workflows/weekly-build.yaml

@@ -0,0 +1,56 @@
+name: Weekly Build
+
+on:
+  schedule:
+    # Run at 00:00 on Sundays
+    - cron: '0 0 * * 0'
+  workflow_dispatch:  # Allows manual execution when needed
+
+jobs:
+  docker:
+    name: Build & Deploy Weekly Docker
+    runs-on: ubuntu-latest
+    if: github.repository_owner == 'wg-easy'
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: master
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ghcr.io/wg-easy/wg-easy
+          flavor: |
+            latest=false
+          tags: |
+            type=raw,value=weekly
+            type=raw,value=weekly-{{date 'YYYY.MM.DD'}}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build & Publish Docker Image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=min