test(android, ci): use headless emulator binary in E2E workflow

Swap to emulator-headless before launch so CI avoids host libX11-xcb
dependency on newer emulator builds. Install pulseaudio and libxkbfile1
for libpulse.so.0 and libxkbfile.so.1 on Ubuntu 24.04. Log unresolved
emulator shared-library deps via ldd before launch (temporary). Keeps
the existing emulator pin for now.

Author: mikehardy

.github/workflows/tests_e2e_android.yml

@@ -122,6 +122,13 @@ jobs:
           sudo udevadm control --reload-rules
           sudo udevadm trigger --name-match=kvm
 
+      - name: Install emulator host dependencies
+        # Headless emulator still dlopens host libs not bundled since emulator 36.3+.
+        # pulseaudio -> libpulse.so.0; libxkbfile1 -> libxkbfile.so.1 (Ubuntu 24.04 noble on ubuntu-latest).
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends pulseaudio libxkbfile1
+
       # https://github.com/actions/checkout/releases
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
@@ -241,11 +248,44 @@ jobs:
           disable-spellchecker: true
           arch: ${{ matrix.arch }}
           emulator-build: 14214601  # needed as of 20251205 when emulator 36.3.10.0 (build_id 14472402) released
+          # Headless binary replaces -no-window; see pre-emulator-launch-script.
+          emulator-options: -gpu swiftshader_indirect -no-snapshot -noaudio -no-boot-anim
           pre-emulator-launch-script: |
             sudo mkdir /mnt/avd
             sudo chown $USER:$USER /mnt/avd
             mkdir -p $HOME/.android
             ln -s /mnt/avd $HOME/.android/avd
+
+            EMULATOR_DIR="$ANDROID_HOME/emulator"
+
+            # Temporary: surface any unresolved emulator shared-library deps in CI logs.
+            report_missing_libs() {
+              local binary="$1"
+              if [ ! -f "$binary" ]; then
+                echo "ldd skip (missing): $binary"
+                return
+              fi
+              if ! file "$binary" | grep -q ELF; then
+                echo "ldd skip (not ELF): $binary"
+                return
+              fi
+              echo "==> ldd missing libs for $binary"
+              ldd "$binary" | grep 'not found' || echo "  (none)"
+            }
+            report_missing_libs "$EMULATOR_DIR/emulator"
+            report_missing_libs "$EMULATOR_DIR/emulator-headless"
+            report_missing_libs "$EMULATOR_DIR/qemu/linux-x86_64/qemu-system-x86_64-headless"
+            report_missing_libs "$EMULATOR_DIR/qemu/linux-x86_64/qemu-system-x86_64"
+
+            # android-emulator-runner always invokes $ANDROID_HOME/emulator/emulator.
+            # Swap to emulator-headless so newer builds avoid host libX11-xcb dependency.
+            if [ -x "$EMULATOR_DIR/emulator-headless" ]; then
+              mv "$EMULATOR_DIR/emulator" "$EMULATOR_DIR/emulator-gui"
+              ln -sf emulator-headless "$EMULATOR_DIR/emulator"
+            else
+              echo "emulator-headless not found in $EMULATOR_DIR" >&2
+              exit 1
+            fi
           script: |
             $ANDROID_HOME/platform-tools/adb devices
             nohup sh -c "$ANDROID_HOME/platform-tools/adb logcat '*:D' > adb-log.txt" &