diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
new file mode 100644
index 0000000..422f81a
--- /dev/null
+++ b/.github/workflows/docker.yml
@@ -0,0 +1,38 @@
+# Builds the API/web image on main and pushes it to GHCR, so the CasaOS
+# host can `docker compose pull` instead of building deps locally.
+name: Docker image
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository }}:latest
+            ghcr.io/${{ github.repository }}:${{ github.sha }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
diff --git a/README.md b/README.md
index b2e670a..7c1f287 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,8 @@ git pull
 docker compose up -d --build
 ```
 
+GitHub Actions runs tests + ruff on every PR (`.github/workflows/ci.yml`) and builds + pushes the image to GHCR on every merge to main (`.github/workflows/docker.yml`). To consume the prebuilt image on the CasaOS host instead of building locally, point the `api`/`web` services at `ghcr.io/agb1986/ai-data-store:latest` (already the `image:` in `docker-compose.yml`) and run `docker compose pull && docker compose up -d` — the local `build:` fallback keeps working either way.
+
 ## Laptop setup
 
 Configure your MCP client with the server URL and API key printed during setup.
diff --git a/docker-compose.yml b/docker-compose.yml
index 89a15bc..b077ca5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -9,6 +9,7 @@ services:
 
   api:
     build: .
+    image: ghcr.io/agb1986/ai-data-store:latest
     restart: unless-stopped
     ports:
       - "8742:8742"
@@ -23,6 +24,7 @@ services:
 
   web:
     build: .
+    image: ghcr.io/agb1986/ai-data-store:latest
     restart: unless-stopped
     command: ["python", "-m", "app.web"]
     ports: