Add workflow for running populate_dandiset_yaml.py

.github/workflows/test-populate-dandiset-yaml.yml

@@ -0,0 +1,47 @@
+name: Tests populate_dandiset_yaml.py
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 6 * * *'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v2
+        with:
+          # Fetch all commits so that versioneer will return something
+          # compatible with semantic-version
+          fetch-depth: 0
+          path: dandi
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.6'
+
+      - name: Install dandi
+        run: |
+          python -m pip install --upgrade pip wheel
+          python -m pip install .
+        working-directory: dandi
+
+      - name: Check out dandi-api-datasets
+        uses: actions/checkout@v2
+        with:
+          repository: dandi/dandi-api-datasets
+          path: dandi-api-datasets
+
+      - name: Install datalad
+        run: python -m pip install datalad
+
+      - name: Check out dandisets
+        run: datalad -r install
+        working-directory: dandi-api-datasets
+
+      - name: Run populate_dandiset_yaml.py
+        run: tools/populate_dandiset_yaml.py [0-9]*
+        working-directory: dandi-api-datasets