chore: remove GHCR workflow from upstream PR

.github/workflows/ghcr-publish.yml

@@ -1,72 +0,0 @@
-name: Publish to GHCR
-
-on:
-  release:
-    types: [published]
-  workflow_dispatch:
-    inputs:
-      version:
-        description: "Version tag to build (e.g. 2.6.0)"
-        required: true
-        type: string
-
-permissions:
-  contents: read
-  packages: write
-
-jobs:
-  docker:
-    name: Build and Push Docker (multi-arch)
-    runs-on: ubuntu-latest
-    env:
-      IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/omniroute
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          ref: ${{ github.event_name == 'workflow_dispatch' && format('refs/tags/v{0}', inputs.version) || '' }}
-
-      - name: Set up QEMU (for multi-arch builds)
-        uses: docker/setup-qemu-action@v4
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to GHCR
-        uses: docker/login-action@v4
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Extract version from release tag or input
-        id: version
-        run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            VERSION="${{ inputs.version }}"
-          else
-            VERSION="${GITHUB_REF_NAME}"
-            VERSION="${VERSION#v}"
-          fi
-          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
-          echo "Publishing Docker image: $IMAGE_NAME:$VERSION"
-
-      - name: Build and push multi-arch image
-        uses: docker/build-push-action@v7
-        with:
-          context: .
-          target: runner-base
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: |
-            ${{ env.IMAGE_NAME }}:${{ steps.version.outputs.version }}
-            ${{ env.IMAGE_NAME }}:latest
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-          no-cache: false
-        env:
-          DOCKER_BUILDKIT_INLINE_CACHE: 1
-
-      - name: Inspect image
-        run: |
-          docker buildx imagetools inspect "${{ env.IMAGE_NAME }}:${{ steps.version.outputs.version }}"