ci: only run at base directory

we don't have to build almost the same thing twice

.github/workflows/ci.yml

@@ -5,9 +5,6 @@ on:
 jobs:
   x86_64-linux:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        project: ['.', 'libs/glfw', 'libs/freetype']
     # We want to run on external PRs, but not on our own internal PRs as they'll be run by the push
     # to the branch.
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
@@ -22,32 +19,29 @@ jobs:
           sudo sh -c 'wget -c https://ziglang.org/builds/zig-linux-x86_64-0.10.0-dev.4060+61aaef0b0.tar.xz -O - | tar -xJ --strip-components=1 -C /usr/local/bin'
       # - name: x86_64-linux -> x86_64-linux-musl
       #   if: matrix.project == 'libs/freetype' || matrix.project == 'libs/glfw'
-      #   run: cd ${{ matrix.project }} && zig build -Dtarget=x86_64-linux-musl
+      #   run: zig build -Dtarget=x86_64-linux-musl
       - name: x86_64-linux -> x86_64-macos
-        run: cd ${{ matrix.project }} && zig build -Dtarget=x86_64-macos.12-none
+        run: zig build -Dtarget=x86_64-macos.12-none
         env:
           AGREE: true
       - name: x86_64-linux -> aarch64-macos
-        run: cd ${{ matrix.project }} && zig build -Dtarget=aarch64-macos.12-none
+        run: zig build -Dtarget=aarch64-macos.12-none
         env:
           AGREE: true
       - name: x86_64-linux -> x86_64-windows
-        run: cd ${{ matrix.project }} && zig build -Dtarget=x86_64-windows-gnu
+        run: zig build -Dtarget=x86_64-windows-gnu
       - name: compile all examples
-        if: matrix.project == '.'
-        run: cd ${{ matrix.project }} && zig build compile-all -Dtarget=x86_64-linux-gnu
+        run: zig build compile-all -Dtarget=x86_64-linux-gnu
       - name: compile all examples (WASM)
-        if: matrix.project == '.'
-        run: cd ${{ matrix.project }} && zig build compile-all -Dtarget=wasm32-freestanding-none
+        run: zig build compile-all -Dtarget=wasm32-freestanding-none
       - name: launch xvfb
         run: Xvfb :99 -screen 0 1680x720x24 > /dev/null 2>&1 &
       - name: test
-        if: matrix.project == '.'
         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
-          cd ${{ matrix.project }} && zig build test
+          zig build 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