Cleanup workflow; Clang not supported yet (#2)

* Tried building with clang 9 and 10, does not work
* Cleanup of build workflow

.github/workflows/build.yml

@@ -3,58 +3,41 @@ name: Build
 on: [push]
 
 env:
-  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
-  BUILD_TYPE: Release
+  BUILD_TYPE: Debug
+  BUILD_DIR: "${{github.workspace}}/build"
 
 jobs:
   build:
-    # The CMake configure and build commands are platform agnostic and should work equally
-    # well on Windows or Mac.  You can convert this to a matrix build if you need
-    # cross-platform coverage.
-    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
     runs-on: ubuntu-20.04
-
+
+    strategy:
+      matrix:
+       include:
+         - cc: gcc-10
+           cxx: g++-10
+
     steps:
     - uses: actions/checkout@v2
 
-#     - name: Get latest CMake and ninja
-#       # Using 'latest' branch, the most recent CMake and ninja are installed.
-#       uses: lukka/get-cmake@latest
-
-#     - name: Get GCC 10
-#       run: >
-#         sudo add-apt-repository ppa:ubuntu-toolchain-r/ppa &&
-#         sudo apt update && 
-#         sudo apt install gcc-10 g++-10
-#       shell: bash
-
     - name: Create Build Environment
-      # Some projects don't allow in-source building, so create a separate build directory
-      # We'll use this as our working directory for all subsequent commands
-      run: cmake -E make_directory ${{github.workspace}}/build
+      run: cmake -E make_directory "${BUILD_DIR}"
 
     - name: Configure CMake
-      # Use a bash shell so we can use the same syntax for environment variable
-      # access regardless of the host operating system
       shell: bash
-      working-directory: ${{github.workspace}}/build
-      # Note the current convention is to use the -S and -B options here to specify source 
-      # and build directories, but this is only available with CMake 3.13 and higher.  
-      # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
-      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+      run: >
+        cmake \
+          -S "${GITHUB_WORKSPACE}" \
+          -B "${BUILD_DIR}" \
+          -DCMAKE_BUILD_TYPE=${BUILD_TYPE}
       env:
-        CC: gcc-10
-        CXX: g++-10
+        CC: ${{matrix.cc}}
+        CXX: ${{matrix.cxx}}
 
     - name: Build
-      working-directory: ${{github.workspace}}/build
       shell: bash
-      # Execute the build.  You can specify a specific target with "--target <NAME>"
-      run: cmake --build . --config $BUILD_TYPE
+      run: cmake --build "${BUILD_DIR}" --config ${BUILD_TYPE}
 
     - name: Test
       working-directory: ${{github.workspace}}/build
       shell: bash
-      # Execute tests defined by the CMake configuration.  
-      # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
-      run: ctest -C $BUILD_TYPE
+      run: ctest -C ${BUILD_TYPE}