github: + catch2 install for build

.github/workflows/cmake-single-platform.yml

@@ -22,6 +22,10 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: Install catch2
+      # install catch2.  see [[https://stackoverflow.com/questions/57982945/how-to-apt-get-install-in-a-github-actions-workflow]]
+      run: sudo apt-get install -y catch2
+
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
@@ -36,4 +40,3 @@ jobs:
       # Execute tests defined by the CMake configuration.
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
       run: ctest -C ${{env.BUILD_TYPE}}
-

FAQ

@@ -1,4 +1,4 @@
-development environment that works
+Q1.  how to get a nix development environment that works
 
 1.
     1. nix stdenv = gcc12Stdenv    (see mkderivation.nix)
@@ -23,3 +23,18 @@ development environment that works
 
     To build,  need to tell cmake to use gcc:
       cmake -DCMAKE_CXX_COMPILER=$(which g++) -DCMAKE_C_COMPILER=$(which gcc) path/to/src
+
+Q2.  how to add a dependency to github workflow
+
+    comments.
+    1. workflow configured in ./.github/cmake-single-platform.yml
+    2. workflow runs on ubuntu vm.  see
+         runs-on: ubuntu-latest
+       in cmake-single-platform.yml
+    3. find a desired dependency
+         $ apt-cache search ${keyword}
+       e.g.
+         $ apt-cache search catch2
+    4. add/edit install step to ./.github/cmake-single-platform.yml
+         - name: Install catch2
+           run: sudo apt-get install -y catch2