Switch Core.build to build/Core

This moves everything back to the build folder, which is cleaner.

Also few improvements to the README.

.gitlab-ci.yml

@@ -9,17 +9,17 @@ LCG:
         - source /cvmfs/sft.cern.ch/lcg/views/LCG_104/x86_64-el9-gcc13-opt/setup.sh
         - ./install.sh
         - source tools/setup.sh
-        - ctest --test-dir Darwin.build --output-junit Testing/Temporary/test_report.xml -j$(nproc)
-        - ctest --test-dir Core.build   --output-junit Testing/Temporary/test_report.xml -j$(nproc)
+        - ctest --test-dir build/Darwin --output-junit Testing/Temporary/test_report.xml -j$(nproc)
+        - ctest --test-dir build/Core   --output-junit Testing/Temporary/test_report.xml -j$(nproc)
     artifacts:
       when: always
       paths:
-        - Darwin.build/Testing/Temporary
-        - Core.build/Testing/Temporary
+        - build/Darwin/Testing/Temporary
+        - build/Core/Testing/Temporary
       reports:
         junit:
-        - Darwin.build/Testing/Temporary/test_report.xml
-        - Core.build/Testing/Temporary/test_report.xml
+        - build/Darwin/Testing/Temporary/test_report.xml
+        - build/Core/Testing/Temporary/test_report.xml
 
 micromamba:
     stage: build
@@ -31,14 +31,14 @@ micromamba:
         - micromamba activate DAS
         - ./install.sh
         - source tools/setup.sh
-        - ctest --test-dir Darwin.build --output-junit Testing/Temporary/test_report.xml -j$(nproc)
-        - ctest --test-dir Core.build   --output-junit Testing/Temporary/test_report.xml -j$(nproc)
+        - ctest --test-dir build/Darwin --output-junit Testing/Temporary/test_report.xml -j$(nproc)
+        - ctest --test-dir build/Core   --output-junit Testing/Temporary/test_report.xml -j$(nproc)
     artifacts:
       when: always
       paths:
-        - Darwin.build/Testing/Temporary
-        - Core.build/Testing/Temporary
+        - build/Darwin/Testing/Temporary
+        - build/Core/Testing/Temporary
       reports:
         junit:
-        - Darwin.build/Testing/Temporary/test_report.xml
-        - Core.build/Testing/Temporary/test_report.xml
+        - build/Darwin/Testing/Temporary/test_report.xml
+        - build/Core/Testing/Temporary/test_report.xml