Add rudimentary GitHub CI

.github/workflows/ci.yml

@@ -0,0 +1,63 @@
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "npm"
+
+      - name: Install root dependencies
+        run: npm ci
+
+      - name: Check formatting
+        run: npm run format:check
+
+      - name: Install common dependencies
+        working-directory: ./common
+        run: npm ci
+
+      - name: Type check common
+        working-directory: ./common
+        run: npx tsc --noEmit
+
+      - name: Build common
+        working-directory: ./common
+        run: npm run build
+
+      - name: Install mcp-server dependencies
+        working-directory: ./mcp-server
+        run: npm ci
+
+      - name: Type check mcp-server
+        working-directory: ./mcp-server
+        run: npx tsc --noEmit
+
+      - name: Build mcp-server
+        working-directory: ./mcp-server
+        run: npm run build
+
+      - name: Install penpot-plugin dependencies
+        working-directory: ./penpot-plugin
+        run: npm ci
+
+      - name: Type check penpot-plugin
+        working-directory: ./penpot-plugin
+        run: npx tsc --noEmit
+
+      - name: Build penpot-plugin
+        working-directory: ./penpot-plugin
+        run: npm run build

package.json

@@ -7,7 +7,8 @@
     "build:all": "concurrently --names \"COMMON,MCP-SERVER,PLUGIN\" --prefix-colors \"green,cyan,magenta\" --success first \"npm --prefix common install && npm --prefix common run build\" \"npm --prefix mcp-server run build\" \"npm --prefix penpot-plugin run build\"",
     "start:all": "concurrently --names \"MCP-SERVER,PLUGIN-SERVER\" --prefix-colors \"cyan,magenta\" --kill-others-on-fail \"npm --prefix mcp-server start\" \"npm --prefix penpot-plugin run dev\"",
     "bootstrap": "npm run install:all && npm run build:all && npm run start:all",
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "format:check": "prettier --check ."
   },
   "repository": {
     "type": "git",