ci: Inline smoketest into build scripts

The smoketest script has gotten significantly simpler, and can simply be
inlined into the build scripts if we don't care about running the tests
twice.

This should fix CI for mailing list patches.

.builds/alpine.yml

@@ -20,9 +20,9 @@ tasks:
       ninja -C build scan-build
       [ -z "$(ls -A build/meson-logs/scanbuild/ 2>/dev/null)" ]
    - smoketest: |
-      timeout -s KILL 30s ./seatd/.builds/smoketest-seatd.sh
+      timeout -s KILL 30s sudo SEATD_LOGLEVEL=debug ./build/seatd-launch ./build/simpletest /dev/dri/card0
    - smoketest-builtin: |
-      timeout -s KILL 30s ./seatd/.builds/smoketest-builtin.sh
+      timeout -s KILL 30s sudo LIBSEAT_BACKEND=builtin ./build/simpletest /dev/dri/card0
    - check-format: |
       ninja -C build clang-format
       git -C seatd diff --exit-code