ci: gh pages

.github/workflows/docker.yml

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+name: Docker Build XBPS container image
+
+on:
+  # manually
+  workflow_dispatch:
+
+env:
+  GHCR_IMAGE: "ghcr.io/xhyrom/${{ github.event.repository.name }}"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - arch: x86_64
+            platform: linux/amd64
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@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 images
+        uses: docker/build-push-action@v5
+        with:
+          context: image
+          platforms: ${{ matrix.config.platform }}
+          outputs: type=image,name=${{ env.GHCR_IMAGE }}:${{ matrix.config.arch }},push=true