32-bit tests (#311)

# Purpose
Compile our OBC tests for a 32-bit architecture to match the hardware it
will be running on

# New Changes
- Added `-m32` compiler args for `Test` CMake target

# Tests
Unit tests still pass:

![image](https://github.com/user-attachments/assets/a6bee41c-9a6e-46bd-8d44-2b63fbe37bd9)

And unit test binaries are now 32 bits:

![image](https://github.com/user-attachments/assets/c9762e55-a601-40ef-8aa1-3b9ddcb19c8e)

---------

Co-authored-by: nbrodbec <contact@nbrodbeck.com>

Author: nbrodbec

.github/workflows/test.yml

@@ -11,6 +11,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+    - name: Install GNU cross compilation
+      run: |
+        sudo apt-get update
+        sudo apt-get install gcc-multilib g++-multilib
     - name: Configure CMake
       run: |
         mkdir build

CMakeLists.txt

@@ -13,6 +13,8 @@ elseif(${CMAKE_BUILD_TYPE} MATCHES HIL)
     include(${CMAKE_SOURCE_DIR}/cmake/fetch_googletest.cmake)
     set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/cmake/toolchain_hil_gcc.cmake)
 elseif(${CMAKE_BUILD_TYPE} MATCHES Test)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
     include(${CMAKE_SOURCE_DIR}/cmake/fetch_googletest.cmake)
     set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/cmake/toolchain_linux_gcc.cmake)
 elseif(${CMAKE_BUILD_TYPE} MATCHES Examples)