Rewrite before_all block in Windows workflow as a one-liner

Author: molinav

.github/workflows/build.yml

@@ -62,10 +62,10 @@ jobs:
               PIP_PREFER_BINARY=1
               PYTHONUNBUFFERED=1
           - os: windows-latest
-            before_all: |
-              echo Starting BEFORE_ALL script
-              echo GEOS_DIR set to: %GEOS_DIR%
-              cd "{package}"
+            before_all: >-
+              echo Starting BEFORE_ALL script &&
+              echo GEOS_DIR set to: %GEOS_DIR% &&
+              cd "{package}" &&
               python -c "import utils; utils.GeosLibrary('%GEOS_VERSION%').build('%GEOS_DIR%', njobs=2)"
             environment: >-
               GEOS_VERSION="3.6.5"