Introduce preference to use CI update channel

app/src/main/java/com/hippo/ehviewer/Settings.kt

@@ -42,6 +42,7 @@ object Settings : DataStorePreferences(null) {
     var meteredNetworkWarning by boolPref("cellular_network_warning", false)
     var appLinkVerifyTip by boolPref("app_link_verify_tip", false)
     var enabledSecurity by boolPref("enable_secure", false)
+    var useCIUpdateChannel by boolPref("ci_update_channel", false)
     var mediaScan by boolPref("media_scan", false).observed { updateWhenKeepMediaStatusChanges() }
     var hasDefaultDownloadLabel by boolPref("has_default_download_label", false)
     var qSSaveProgress by boolPref("qs_save_progress", true)

app/src/main/java/com/hippo/ehviewer/ui/settings/AboutScreen.kt

@@ -18,6 +18,7 @@ import androidx.compose.ui.res.stringResource
 import androidx.core.text.parseAsHtml
 import com.hippo.ehviewer.BuildConfig
 import com.hippo.ehviewer.R
+import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.ui.LICENSE_SCREEN
 import com.hippo.ehviewer.ui.LocalNavController
 import com.hippo.ehviewer.ui.tools.toAnnotatedString
@@ -74,6 +75,10 @@ fun AboutScreen() {
                 title = stringResource(id = R.string.settings_about_version),
                 summary = versionCode(),
             )
+            SwitchPreference(
+                title = stringResource(id = R.string.use_ci_update_channel),
+                value = Settings::useCIUpdateChannel,
+            )
             Preference(title = stringResource(id = R.string.settings_about_check_for_updates))
         }
     }