Fiddle more with gh actions

.github/workflows/build_cmake.yml

@@ -1,99 +1,55 @@
-name: continuous-integration
+name: Linux
 
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-    types: [opened, synchronize]
+on: [push]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: RelWithDebInfo
 
 jobs:
-  test-docs-build:
-    runs-on: ubuntu-20.04
-    steps:
-      - uses: actions/checkout@v2
-      - name: Build Doxygen Docs
-        uses: mattnotmitt/[email protected]
+  build:
 
-  continuous-integration:
     runs-on: ${{ matrix.os }}
-    env:
-      BUILD_TYPE: Debug
     strategy:
-      fail-fast: true
       matrix:
         os: [macos-10.15, ubuntu-20.04]
         cxx: [g++-10, clang++]
         include:
-          - os: windows-2019
-            cxx: msvc
+          - os: windows-2019    
+            cxx: msvc      
 
     steps:
-      - uses: actions/checkout@v2
-
-      - name: Cache CMake dependency source code
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-cmake-dependency-sources
-        with:
-          # CMake cache is at ${{github.workspace}}/build/_deps but we only will cache folders ending in '-src' to cache source code
-          path: ${{github.workspace}}/build/_deps/*-src
-          # Cache hash is dependent on CMakeLists files anywhere as these can change what's in the cache, as well as cmake modules files
-          key: ${{ env.cache-name }}-${{ hashFiles('**/CMakeLists.txt', 'cmake/**') }}
-          # it's acceptable to reuse caches for different CMakeLists content if exact match is not available and unlike build caches, we
-          # don't need to restrict these by OS or compiler as it's only source code that's being cached
-          restore-keys: |
-            ${{ env.cache-name }}-
-
-      - name: Cache CMake dependency build objects
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-cmake-dependency-builds
-        with:
-          # CMake cache is at ${{github.workspace}}/build/_deps but we only care about the folders ending in -build or -subbuild
-          path: |
-            ${{github.workspace}}/build/_deps/*-build
-            ${{github.workspace}}/build/_deps/*-subbuild
-          # Cache hash is dependent on CMakeLists files anywhere as these can change what's in the cache, as well as cmake modules files
-          key: ${{ env.cache-name }}-${{ matrix.os }}-${{ matrix.cxx }}-${{ hashFiles('**/CMakeLists.txt', 'cmake/**') }}
-          # it's acceptable to reuse caches for different CMakeLists content if exact match is not available
-          # as long as the OS and Compiler match exactly
-          restore-keys: |
-            ${{ env.cache-name }}-${{ matrix.os }}-${{ matrix.cxx }}-
-
-      # when building on master branch and not a pull request, build and test in release mode (optimised build)
-      - name: Set Build Mode to Release
-        shell: bash
-        if: ${{ github.event_name != 'pull_request' && github.ref == 'refs/heads/master' }}
-        run: echo "BUILD_TYPE=Release" >> $GITHUB_ENV
-
-      - name: Configure CMake
-        env:
-          CXX: ${{ matrix.cxx }}
-        # 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 -DCMAKE_INSTALL_PREFIX:PATH=$GITHUB_WORKSPACE/test_install -DENABLE_TESTS=ON
-
-      - 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
-
-      - 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 --no-tests=error
-
-      - name: Test Install
-        working-directory: ${{github.workspace}}/build
-        shell: bash
-        # Test install with CMake to the "test_install" directory
-        run: cmake --install . --config $BUILD_TYPE
+    - uses: actions/checkout@v2
+
+    - 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 ${{runner.workspace}}/build
+
+    - 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: ${{runner.workspace}}/build
+      env:
+        CXX: g++-10
+      # 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
+      # 
+      # We need to source the profile file to make sure conan is in PATH
+      run: |
+        cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+    - name: Build
+      working-directory: ${{runner.workspace}}/build
+      shell: bash
+      # Execute the build.  You can specify a specific target with "--target <NAME>"
+      run: cmake --build . --config $BUILD_TYPE
+
+    - name: Test
+      working-directory: ${{runner.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