CI: add building workflow

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: Build
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  run_build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+      with:
+        python-version: 3.11.2
+
+    - run: |
+        set -vxeuo pipefail
+        pip install pyodide-build>=0.23.0
+        echo EMSCRIPTEN_VERSION=$(pyodide config get emscripten_version) >> $GITHUB_ENV
+        echo "EMSCRIPTEN_VERSION is $EMSCRIPTEN_VERSION"
+
+    - uses: mymindstorm/setup-emsdk@v12
+      with:
+        version: ${{ env.EMSCRIPTEN_VERSION }}
+
+    - run: |
+        set -vxeuo pipefail
+        git clone https://github.com/Pylons/paginate
+        cd paginate/
+        pyodide build
+        ls -la