use absolute path to examples folder

Author: mcflugen

.github/workflows/test.yml

@@ -42,7 +42,7 @@ jobs:
       - name: Test
         run: |
           pytest --cov=heat --cov-report=xml:./coverage.xml -vvv
-          bmi-test heat:BmiHeat --config-file=./examples/heat.yaml --root-dir=./examples -vvv
+          bmi-test heat:BmiHeat --config-file=${GITHUB_WORKSPACE}/examples/heat.yaml --root-dir=examples -vvv
 
       - name: Coveralls
         if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.11'