feat: add build to CI

.github/actions/prepare/action.yml

@@ -0,0 +1,19 @@
+description: Prepares the repo for a CI job
+
+name: Prepare
+
+runs:
+  steps:
+    - name: Setup Node.js
+      id: setup-node
+      uses: actions/setup-node@v4
+      with:
+        node-version-file: .nvmrc
+        cache: npm
+
+    - name: Install Dependencies
+      id: npm-ci
+      run: npm ci
+      shell: bash
+
+  using: composite

.github/workflows/ci.yml

@@ -17,20 +17,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout
-        id: checkout
-        uses: actions/checkout@v4
-
-      - name: Setup Node.js
-        id: setup-node
-        uses: actions/setup-node@v4
-        with:
-          node-version-file: .nvmrc
-          cache: npm
-
-      - name: Install Dependencies
-        id: npm-ci
-        run: npm ci
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/prepare
 
       - name: Lint
         id: npm-lint
@@ -39,3 +27,19 @@ jobs:
       - name: Test
         id: npm-test
         run: npm run test
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/prepare
+
+      - name: Build runtime
+        run: npm run build
+
+      - name: Build plugins
+        run: npm run build:plugins
+
+      - name: Build styles
+        run: npm run build:styles-example