feat: add deploy pipeline and switch Dockerfile to COPY-based build

Add deploy_server Drone pipeline that builds and pushes the Docker image
to Gitea Container Registry, then deploys to VPS via SSH. Switch
Dockerfile from git clone to COPY-based build for CI compatibility and
better layer caching. Change exposed port to 3001.

.drone.yml

@@ -27,3 +27,46 @@ steps:
     commands:
       - npm ci
       - npm run check_format
+
+---
+
+kind: pipeline
+type: docker
+name: deploy_server
+
+steps:
+  - name: upload_to_registry
+    image: plugins/docker
+    settings:
+      registry: gitea.gilmour109.de
+      repo: gitea.gilmour109.de/Gilmour109/calchat-server
+      dockerfile: apps/server/docker/Dockerfile
+      tags:
+        - latest
+        - main
+      username:
+        from_secret: gitea_username
+      password:
+        from_secret: gitea_password
+
+  - name: ssh
+    image: appleboy/drone-ssh
+    settings:
+      host:
+        - 10.0.0.1
+      username: root
+      password:
+        from_secret: vps_ssh_password
+      envs:
+        - gitea_username
+        - gitea_password
+      port: 22
+      command_timeout: 2m
+      script:
+        - docker login -u $GITEA_USERNAME -p $GITEA_PASSWORD gitea.gilmour109.de
+        - docker pull gitea.gilmour109.de/gilmour109/calchat-server:latest
+        - docker compose -f /root/calchat-mongo/docker-compose.yml up -d
+
+depends_on:
+  - server_build_and_test
+  - check_for_formatting

CLAUDE.md

@@ -62,7 +62,7 @@ npm run test -w @calchat/server         # Run Jest unit tests
 | | ical.js | iCalendar parsing/generation |
 | Testing | Jest / ts-jest | Server unit tests |
 | Deployment | Docker | Server containerization (multi-stage build) |
-| | Drone CI | CI/CD pipelines (build, test, format check) |
+| | Drone CI | CI/CD pipelines (build, test, format check, deploy) |
 | Planned | iCalendar | Event export/import |
 
 ## Architecture
@@ -544,13 +544,11 @@ docker compose up -d                  # Start Radicale CalDAV server
 
 ### Server Docker Image
 ```bash
-# Build (clones from Gitea, no local context needed):
+# Build (requires local build context):
 docker build -f apps/server/docker/Dockerfile -t calchat-server .
-# Build from a specific branch:
-docker build -f apps/server/docker/Dockerfile --build-arg BRANCH=feature-x -t calchat-server .
-docker run -p 3000:3000 --env-file apps/server/.env calchat-server
+docker run -p 3001:3001 --env-file apps/server/.env calchat-server
 ```
-Multi-stage build: clones the repo from Gitea (`git clone --depth 1`) in the build stage using a `BRANCH` build arg (default: `main`), compiles shared + server, then copies only `dist/` and production dependencies to the runtime stage. No local source context required — the image can be built on any machine with Docker.
+Multi-stage COPY-based build: copies `package.json` files first for layer caching, then source code. Compiles shared + server, then copies only `dist/` and production dependencies to the runtime stage. Exposes port 3001. In CI, the `plugins/docker` Drone plugin builds and pushes the image automatically.
 
 ### Environment Variables
 Server requires `.env` file in `apps/server/`:
@@ -700,10 +698,11 @@ This uses the `preview` profile from `eas.json` which builds an APK with:
 
 ## CI/CD (Drone)
 
-The project uses Drone CI (`.drone.yml`) with two pipelines:
+The project uses Drone CI (`.drone.yml`) with three pipelines:
 
 1. **`server_build_and_test`**: Builds the server (`npm ci` + `npm run build`) and runs Jest tests (`npm run test`)
 2. **`check_for_formatting`**: Checks Prettier formatting across all workspaces (`npm run check_format`)
+3. **`deploy_server`**: Builds Docker image, pushes to Gitea Container Registry (`gitea.gilmour109.de/Gilmour109/calchat-server`), then SSHs into VPS (`10.0.0.1`) to pull and restart via `docker compose`. Depends on both pipelines above passing first.
 
 ## Testing
 

apps/server/docker/Dockerfile

@@ -1,15 +1,17 @@
 FROM node:alpine AS build
 
-RUN apk add --no-cache git
-
-ARG BRANCH=main
 WORKDIR /app
-RUN git clone --branch ${BRANCH} --depth 1 https://gitea.gilmour109.de/Gilmour109/calchat.git .
 
-RUN npm ci --workspace=@calchat/server --workspace=@calchat/shared --include-workspace-root
+COPY package.json package-lock.json ./
+COPY packages/shared/package.json ./packages/shared/
+COPY apps/server/package.json ./apps/server/
 
-RUN npm run build --workspace=@calchat/shared && \
-    npm run build --workspace=@calchat/server
+RUN npm ci -w @calchat/server -w @calchat/shared --include-workspace-root
+
+COPY packages/shared/ packages/shared/
+COPY apps/server/ apps/server/
+
+RUN npm run build -w @calchat/shared && npm run build -w @calchat/server
 
 FROM node:alpine
 
@@ -19,11 +21,11 @@ COPY --from=build /app/package.json /app/package-lock.json ./
 COPY --from=build /app/packages/shared/package.json packages/shared/
 COPY --from=build /app/apps/server/package.json apps/server/
 
-RUN npm ci --omit=dev --workspace=@calchat/server --workspace=@calchat/shared --include-workspace-root
+RUN npm ci --omit=dev -w @calchat/server -w @calchat/shared
 
 COPY --from=build /app/packages/shared/dist/ packages/shared/dist/
 COPY --from=build /app/apps/server/dist/ apps/server/dist/
 
-EXPOSE 3000
+EXPOSE 3001
 
 CMD ["node", "apps/server/dist/app.js"]