Build containers in CI

.github/dependabot.yml

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+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/main.yml

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+name: containerised
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  server-base:
+    strategy:
+      matrix:
+        image-name: ["server-base", "secret-generation"]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        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: Login to GitHub container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ${{ matrix.image-name }}
+          push: ${{ github.event_name == 'push' && github.repository == 'DIRACGrid/container-images' && github.ref_name == 'main' }}
+          tags: ghcr.io/diracgrid/diracx/${{ matrix.image-name }}:latest
+          platforms: linux/amd64,linux/arm64