add GHA to convert CDL <-> NC

.github/dependabot.yml

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+# See https://docs.github.com/en/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically/keeping-your-actions-up-to-date-with-dependabot
+
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "Bot"

.github/workflows/convert_cdl_nc_cdl.yml

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+name: Full Tests
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Setup Micromamba Python
+      uses: mamba-org/setup-micromamba@v1
+      with:
+        environment-name: GHA
+        init-shell: bash
+        create-args: >-
+          python=3 netcdf4 --channel conda-forge
+
+    - name: Convert NC files to CDL and back
+      shell: bash -l {0}
+      run: |
+        python convert_nc_cdl.py

convert_nc_cdl.py

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+from netCDF4 import Dataset
+
+
+def convert_nc_to_cdl(nc_fname):
+    cdl_fname = nc_fname.with_suffix(".cdl")
+    if cdl_fname.exists():
+        print(f"The {cdl_fname} file already exists, not overwriting it.")
+        return
+    with Dataset(nc_fname) as nc:
+        print(f"Converting {nc_fname} to {cdl_fname}.")
+        nc.tocdl(coordvars=True, data=True, outfile=cdl_fname)
+
+def convert_cdl_to_nc(cdl_name):
+    nc_fname = cdl_fname.with_suffix(".nc")
+    if nc_fname.exists():
+        print(f"The {nc_fname} file already exists, not overwriting it.")
+        return
+    print(f"Converting {cdl_fname} to {nc_fname}.")
+    Dataset.fromcdl(cdl_fname)
+
+
+if __name__ == "__main__":
+    from pathlib import Path
+
+    datasets_path = Path("datasets")
+    for nc_fname in datasets_path.glob("*.nc"):
+        convert_nc_to_cdl(nc_fname)
+
+    for cdl_fname in datasets_path.glob("*.cdl"):
+        convert_cdl_to_nc(cdl_fname)