feat: initial mdBook setup with CI/CD

- mdBook structure
- Multi-image Docker build
- Deploy to books.softwarehuset.com

.forgejo/workflows/ci.yml

@@ -0,0 +1,77 @@
+# books
+name: books
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+env:
+  REGISTRY: code.core.ci/softwarehuset
+  IMAGES: |
+    ./Dockerfile|books|.
+
+jobs:
+  docker:
+    name: docker
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to registry
+        run: echo "${{ secrets.FORGEJO_TOKEN }}" | docker login code.core.ci -u djohn --password-stdin
+
+      - name: Build & Push images
+        run: |
+          set -e
+          
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            TAG="pr-${{ github.event.number }}"
+          else
+            TAG="${{ github.sha }}"
+          fi
+          
+          IS_MAIN="${{ github.ref == 'refs/heads/main' }}"
+          
+          echo "${{ env.IMAGES }}" | grep -v '^[[:space:]]*$' | while IFS='|' read -r dockerfile image context; do
+            dockerfile=$(echo "$dockerfile" | xargs)
+            image=$(echo "$image" | xargs)
+            context=$(echo "$context" | xargs)
+            
+            [ -z "$dockerfile" ] && continue
+            
+            FULL_IMAGE="${{ env.REGISTRY }}/${image}"
+            
+            echo "🐳 Building: ${FULL_IMAGE}:${TAG}"
+            docker build -f "${dockerfile}" -t "${FULL_IMAGE}:${TAG}" "${context}"
+            docker push "${FULL_IMAGE}:${TAG}"
+            
+            if [ "$IS_MAIN" = "true" ]; then
+              docker tag "${FULL_IMAGE}:${TAG}" "${FULL_IMAGE}:latest"
+              docker push "${FULL_IMAGE}:latest"
+            fi
+          done
+
+  deploy:
+    name: deploy
+    needs: [docker]
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    container:
+      image: bitnami/kubectl:1.31
+    steps:
+      - name: Checkout
+        env:
+          TOKEN: ${{ secrets.FORGEJO_TOKEN }}
+        run: |
+          cd /tmp && git clone --depth=1 "https://djohn:${TOKEN}@code.core.ci/${{ github.repository }}.git" repo
+      - name: Deploy
+        env:
+          KUBECONFIG_DATA: ${{ secrets.KUBE_CONFIG }}
+        run: |
+          echo "$KUBECONFIG_DATA" | base64 -d > /tmp/kubeconfig
+          export KUBECONFIG=/tmp/kubeconfig
+          cd /tmp/repo/k8s/prod
+          kubectl kustomize . | kubectl apply -f -
+          kubectl -n books set image deployment/books web=${{ env.REGISTRY }}/books:${{ github.sha }}
+          kubectl -n books rollout status deployment/books --timeout=120s