set the cmake build to out-of-source

Author: pdebuyl

.github/workflows/main.yml

@@ -52,10 +52,10 @@ jobs:
       run: brew install gcc@${GCC_V} || brew upgrade gcc@${GCC_V} || true
 
     - name: Configure with CMake
-      run: cmake -Wdev -S . -B . # We should build out of source but loadtxt needs fixing
+      run: cmake -Wdev -S . -B build # We should build out of source but loadtxt needs fixing
 
     - name: Build and compile
-      run: cmake --build . || cmake --build . --verbose --parallel 1
+      run: cmake --build build || cmake --build build --verbose --parallel 1
 
     - name: test
-      run: cmake --build . --target test
+      run: cmake --build build --target test