{core,gpu}: CI: clone with submodules

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

libs/gpu/.github/workflows/ci.yml

@@ -8,6 +8,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          submodules: 'true'
       - name: Setup Zig
         run: |
           sudo apt install xz-utils
@@ -26,6 +28,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          submodules: 'true'
       - name: Setup Zig
         run: |
           $ProgressPreference = 'SilentlyContinue'
@@ -47,6 +51,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          submodules: 'true'
       - name: Setup Zig
         run: |
           brew install xz