github: add macOS to our build set

Do a little bit of action cleanup while we are at it.

Signed-off-by: Kyle Evans <[email protected]>

.github/workflows/build.yml

@@ -10,26 +10,41 @@ permissions:
 
 jobs:
   build:
-    name: Build ${{ matrix.os }}@lua${{ matrix.lua }}
+    name: Build ${{ matrix.os }} (lua${{ matrix.lua }})
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04]
+        os: [ubuntu-20.04, ubuntu-22.04, macos-latest]
         lua: [5.2, 5.3, 5.4]
         include:
           - os: ubuntu-20.04
+            lua_incdir: /usr/include/lua${{ matrix.lua }}
+            lua_lib: -llua${{ matrix.lua }}
           - os: ubuntu-22.04
+            lua_incdir: /usr/include/lua${{ matrix.lua }}
+            lua_lib: -llua${{ matrix.lua }}
+          - os: macos-latest
+            lua: 5.4
+            pkgs: bmake [email protected]
+            lua_incdir: /opt/homebrew/Cellar/lua/5.4.6/include/lua
+            lua_lib: -L/opt/homebrew/Cellar/lua/5.4.6/lib -llua${{ matrix.lua }}
         exclude:
           - os: ubuntu-20.04
             lua: 5.4
     steps:
       - name: checkout
         uses: actions/checkout@v4
-      - name: install system packages
+      - name: install system packages (Ubuntu)
+        if: runner.os == 'Linux'
         run: |
           sudo apt-get update --quiet || true
           sudo apt-get -yq --no-install-suggests --no-install-recommends install bmake liblua${{ matrix.lua }}-dev
-      - name: linux build
+      - name: install system packages (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew update --quiet || true
+          brew install ${{ matrix.pkgs }}
+      - name: build orch(1)
         run: |
-          env ORCHLUA_PATH=/usr/share/orch LUA_INCDIR=/usr/include/lua${{ matrix.lua }} \
-              LUA_LIB=-llua${{ matrix.lua }} bmake
+          env ORCHLUA_PATH=/usr/share/orch LUA_INCDIR=${{ matrix.lua_incdir }} \
+              LUA_LIB=${{ matrix.lua_lib }} bmake