mach-sysaudio moves back into the main repository

Helps hexops/mach#1165

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

.github/workflows/ci.yml

@@ -37,12 +37,22 @@ jobs:
         run: zig build -Dtarget=x86_64-windows-gnu
       - name: launch xvfb
         run: Xvfb :99 -screen 0 1680x720x24 > /dev/null 2>&1 &
-      - name: test
+      # TODO: do we actually need this?
+      - name: install Linux dependencies
         run: |
           sudo add-apt-repository -y ppa:kisak/kisak-mesa
           sudo apt-get update
           sudo apt-get install mesa-utils mesa-utils-extra mesa-va-drivers mesa-vdpau-drivers mesa-vulkan-drivers xvfb pulseaudio jackd
-          zig build test
+      - name: test
+        run: zig build test
+      - name: test (with core deps only)
+        run: zig build -Dcore test
+      - name: test (with sysaudio deps only)
+        run: zig build -Dsysaudio test
+      - name: test (with sysgpu deps only)
+        run: zig build -Dsysgpu test
+      - name: test (specific deps only)
+        run: zig build -Dcore -Dsysaudio -Dsysgpu test
   x86_64-windows:
     runs-on: windows-latest
     # We want to run on external PRs, but not on our own internal PRs as they'll be run by the push