ci: test example models on all platforms (#2105)

We previously only tested the example models on Linux. We have recently seen some platform-specific behavior differences in whose consideration it seems wise to test all platforms.

Author: wpbonelli

.github/workflows/ci.yml

@@ -317,16 +317,13 @@ jobs:
           pixi run autotest -m "$markers" -k "$filters"
 
       - name: Install executables
-        if: runner.os == 'Linux'
         uses: modflowpy/install-modflow-action@v1
 
       - name: Test examples
-        if: runner.os == 'Linux'
         working-directory: modflow6
         shell: pixi run bash -e {0}
         run: |
-          cp bin/mf6 ~/.local/bin/modflow/
-          cp bin/libmf6.so ~/.local/bin/modflow/
+          cp -R bin/* ~/.local/bin/modflow/
           cd ../modflow6-examples/autotest
           pytest -v -n auto test_scripts.py
 
@@ -477,8 +474,7 @@ jobs:
         working-directory: modflow6
         shell: pixi run bash -e {0}
         run: |
-          cp bin/mf6 ~/.local/bin/modflow/
-          cp bin/libmf6.so ~/.local/bin/modflow/
+          cp -R bin/* ~/.local/bin/modflow/
           cd ../modflow6-examples/autotest
           pytest -v -n auto test_scripts.py