use ci paths

Author: cvanelteren

.github/workflows/build.yml

@@ -72,10 +72,10 @@ jobs:
           CIBW_BEFORE_BUILD: >
             python -c "import utils; utils.GeosLibrary('${{ env.GEO_VERSION }}').build('extern', njobs=16)"
           CIBW_ENVIRONMENT: >
-            GEOS_DIR=$GITHUB_WORKSPACE/extern
-            CPATH=$GITHUB_WORKSPACE/extern/include
-            LIBRARY_PATH=$GITHUB_WORKSPACE/extern/lib
-            LD_LIBRARY_PATH=$GITHUB_WORKSPACE/extern/lib
+            GEOS_DIR=/{project}/extern
+            CPATH=/{project}/extern/include
+            LIBRARY_PATH=/{project}/extern/lib
+            LD_LIBRARY_PATH=/{project}/extern/lib
             SETUPTOOLS_USE_DISTUTILS=stdlib
           CIBW_TEST_COMMAND: >
             cd {project}