diff --git a/ci-cd.yml b/ci-cd.yml
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+# CI: Maven build + unit tests on every push/PR to main or master.
+# CD: Build Docker image and push to GitHub Container Registry (ghcr.io) on push to main/master.
+# Optional: SSH deploy when repository variable ENABLE_SSH_DEPLOY=true and deploy secrets are set.
+#
+# Repository variables (Settings → Secrets and variables → Actions → Variables):
+#   ENABLE_SSH_DEPLOY = true   (optional; omit or false to skip deploy job)
+#
+# Optional deploy secrets (Settings → Secrets and variables → Actions → Secrets):
+#   DEPLOY_HOST, DEPLOY_USER, DEPLOY_SSH_KEY, DEPLOY_SCRIPT
+#   DEPLOY_SCRIPT: multiline shell to run on the server (e.g. cd /opt/app && docker compose pull && docker compose up -d)
+#
+# Pull the image as: ghcr.io/<owner>/<repo>:latest or :<git-sha>
+
+name: CI/CD
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  JAVA_VERSION: "21"
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: ${{ env.JAVA_VERSION }}
+          cache: maven
+
+      # Unit tests only; @EnabledIfEnvironmentVariable(RUN_INTEGRATION_TESTS) tests stay skipped unless you add a separate job with secrets.
+      - name: Maven verify
+        run: mvn -B -ntp verify
+
+  docker-build-push:
+    needs: build-and-test
+    if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Image name (lowercase for GHCR)
+        id: image
+        run: |
+          IMG=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
+          echo "name=ghcr.io/${IMG}" >> "$GITHUB_OUTPUT"
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: |
+            ${{ steps.image.outputs.name }}:latest
+            ${{ steps.image.outputs.name }}:${{ github.sha }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  deploy:
+    needs: docker-build-push
+    # Set ENABLE_SSH_DEPLOY=true in repo Variables to run this job; otherwise skipped.
+    if: vars.ENABLE_SSH_DEPLOY == 'true'
+    runs-on: ubuntu-latest
+    # Optional: uncomment for manual approval gates (create "production" in Environments first).
+    # environment: production
+    steps:
+      - name: Deploy over SSH
+        uses: appleboy/ssh-action@v1.2.2
+        with:
+          host: ${{ secrets.DEPLOY_HOST }}
+          username: ${{ secrets.DEPLOY_USER }}
+          key: ${{ secrets.DEPLOY_SSH_KEY }}
+          script: ${{ secrets.DEPLOY_SCRIPT }}