tests: Add an address sanitizer suppression file

There are two places where we deliberately leak some memory. There are
some cases which look like leaks in libostree but it's not impossible
that we made a mistake in flatpak.

Two other cases seem like issues in flatpak that I couldn't figure out.

tests/flatpak-asan.supp

@@ -0,0 +1,10 @@
+# GOnce, deliberately leaking once per process
+leak:flatpak_get_user_base_dir_location
+leak:flatpak_get_system_default_base_dir_location
+# external (libostree)
+leak:static_delta_part_execute_thread
+leak:_ostree_static_delta_part_open
+# Bugs in our code
+# Take a look at them and try to figure out  what's going on!
+leak:flatpak_authenticator_request_proxy_new_for_bus_sync
+leak:flatpak_authenticator_proxy_new_for_bus_sync

tests/meson.build

@@ -37,7 +37,7 @@ tests_environment_prepend = {
   'PATH' : project_build_root / 'app',
 }
 
-lsan_options = 'log_threads=1'
+lsan_options = 'log_threads=1:suppressions=' + meson.current_source_dir() / 'flatpak-asan.supp'
 
 if get_option('installed_tests')
   configure_file(