Develop package in docs in CI

Author: Frankie Robertson

.github/workflows/CI.yml

@@ -59,6 +59,8 @@ jobs:
       - name: Set CAT packages to develop & resolve env
         run: |
           julia --project=docs/ -e 'using Pkg;
+                                    Pkg.develop(path=".");
+                                    Pkg.resolve();
                                     Pkg.instantiate()'
       - uses: julia-actions/julia-buildpkg@v1
         with: