Add build workflow

.github/workflows/build.yml

@@ -0,0 +1,90 @@
+name: Build
+
+on:
+  push:
+    branches: master
+  pull_request:
+    branches: '*'
+
+jobs:
+  build:
+    name: Build tljh_repo2docker
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Conda environment with Micromamba
+        uses: mamba-org/setup-micromamba@v1
+        with:
+          environment-name: tljh
+          create-args: >-
+            python=3.10
+            nodejs=18
+            yarn=3
+
+      - name: Setup pip cache
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache/pip
+          key: pip-3.10-${{ hashFiles('setup.py') }}
+          restore-keys: |
+            pip-3.10-
+            pip-
+
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - name: Setup yarn cache
+        uses: actions/cache@v2
+        id: yarn-cache 
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: yarn-${{ hashFiles('frontend/yarn.lock') }}
+          restore-keys: |
+            yarn-
+
+      - name: Package the application
+        shell: bash -l {0}
+        run: |
+          set -eux
+          pip install build
+          python -m build .
+
+      - name: Upload package
+        uses: actions/upload-artifact@v3
+        with:
+          name: tljh_repo2docker-artifacts
+          path: |
+            dist/tljh_repo2docker*.whl
+          if-no-files-found: error
+
+  test_isolated:
+    needs: build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+          architecture: 'x64'
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: tljh_repo2docker-artifacts
+
+      - name: Install and Test
+        run: |
+          set -eux
+          # Remove NodeJS, twice to take care of system and locally installed node versions.
+          sudo rm -rf $(which node)
+          sudo rm -rf $(which node)
+
+          python -m pip install tljh_repo2docker*.whl
+
+      - name: Test import
+        shell: bash -l {0}
+        run: python -c "import tljh_repo2docker"