[INFRA] use tributors to list contributors and CITATION.cff for referencing

.codespellrc

@@ -1,6 +1,6 @@
 [codespell]
-skip = *.js,*.svg,*.eps,.git,node_modules,env,venv,.mypy_cache,package-lock.json
-ignore-words-list = fo,te,als,Acknowledgements,acknowledgements,winn
+skip = *.js,*.svg,*.eps,.git,node_modules,env,venv,.mypy_cache,package-lock.json,CITATION.cff,tools/new_contributors.tsv,./tools/schemacode/docs/build
+ignore-words-list = fo,te,als,Acknowledgements,acknowledgements,weill,bu,winn
 builtin = clear,rare,en-GB_to_en-US
 # this overloads default dictionaries and I have not yet figured out
 # how to have multiple https://github.com/codespell-project/codespell/issues/2727

.github/workflows/validation.yml

@@ -81,3 +81,18 @@ jobs:
         run: |
           python no-bad-latin.py
         working-directory: tools
+
+  # Validate CITATION.cff
+  validate_cff:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+      with:
+        python-version: 3
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools
+        pip3 install cffconvert
+    - name: Validate CITATION.cff
+      run: make validate_citation_cff