use cmake to build roms, too; it just calls existing makefile

.github/workflows/build.yaml

@@ -21,11 +21,13 @@ jobs:
 
       - uses: "actions/checkout@v3"
 
-      - name: "Build artifacts"
+      - name: "Build"
         run: |
           set -x
-          cd rom
-          make
+          mkdir build
+          cd build
+          cmake ..
+          cmake --build . --target roms
 
       - uses: "actions/upload-artifact@v3"
         with:

CMakeLists.txt

@@ -8,3 +8,4 @@ include(GNUInstallDirs)
 
 add_subdirectory(src)
 add_subdirectory(conf)
+add_subdirectory(rom)

rom/CMakeLists.txt

@@ -0,0 +1 @@
+add_custom_target(roms COMMAND make WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})