add jlab extension build

.github/workflows/build_jlext.yml

@@ -0,0 +1,64 @@
+on:
+  workflow_call:
+    inputs:
+      artifact-name:
+        required: false
+        type: string
+        default: 'artifact'
+
+jobs:
+  build_java_project:
+    runs-on: ubuntu_act_on_20
+    # container:
+    #   image: catthehacker/ubuntu:act-latest
+    env:
+      RUNNER_TOOL_CACHE: /toolcache
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Base Setup
+        uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+
+      - name: Install dependencies
+        run: python -m pip install -U "jupyterlab>=4.0.0,<5"
+  
+      - name: Lint the extension
+        run: |
+          set -eux
+          jlpm
+          jlpm run lint:check
+  
+      - name: Test the extension
+        run: |
+          set -eux
+          jlpm run test
+  
+      - name: Build the extension
+        run: |
+          set -eux
+          python -m pip install .[test]
+  
+          pytest -vv -r ap --cov alab_project_ext
+          jupyter server extension list
+          jupyter server extension list 2>&1 | grep -ie "alab_project_ext.*OK"
+  
+          jupyter labextension list
+          jupyter labextension list 2>&1 | grep -ie "alab-project-ext.*OK"
+          python -m jupyterlab.browser_check
+  
+      - name: Package the extension
+        run: |
+          set -eux
+  
+          pip install build
+          python -m build
+          pip uninstall -y "alab_project_ext" jupyterlab
+  
+      - name: Upload extension packages
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ inputs.artifact-name }}
+          path: |
+            dist
+            docker
+          if-no-files-found: error