ci(session-e2e): init portaudio submodule and install ALSA headers

The console path links the vendored PortAudio cgo package, which needs the
pa_src git submodule checked out and (on Linux) libasound2-dev for the ALSA
host API. Add submodules: recursive to checkout and a Linux-only apt step.

Author: u9g

.github/workflows/session-e2e.yaml

@@ -49,6 +49,12 @@ jobs:
     steps:
       - name: Checkout livekit-cli
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          submodules: recursive
+
+      - name: Install ALSA headers (Linux)
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y libasound2-dev
 
       - name: Set up Go
         uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6