ci: deploy using GitHub Pages

.github/workflows/flutter.yml

@@ -19,4 +19,10 @@ jobs:
       - run: flutter doctor
       - run: flutter pub get
       - run: flutter test
-      - run: flutter build web
+      - run: flutter build web --base-href "/flutter_application_alertmanager/"
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v4
+        if: github.ref == 'refs/heads/main'
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./build/web

lib/main.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 
+import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:flutter/material.dart';
 import 'package:http/http.dart' as http;
 import 'package:shared_preferences/shared_preferences.dart';
@@ -96,9 +97,17 @@ class _AlertListScreenState extends State<AlertListScreen> {
 
   Future<void> _initConnection() async {
     final prefs = await SharedPreferences.getInstance();
-    baseUrl =
-        prefs.getString('alertmanager_url') ??
-        'http://prometheus-alertmanager:9093';
+    if (kIsWeb && Uri.base.scheme == 'https') {
+      // On web & served via HTTPS → use public demo Alertmanager if unset
+      baseUrl =
+          prefs.getString('alertmanager_url') ??
+          'https://alertmanager.demo.prometheus.io';
+    } else {
+      // Fallback to saved URL or local instance
+      baseUrl =
+          prefs.getString('alertmanager_url') ??
+          'http://prometheus-alertmanager:9093';
+    }
     _fetchAlerts();
   }
 

pubspec.lock

@@ -350,7 +350,7 @@ packages:
     source: hosted
     version: "15.0.0"
   web:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: web
       sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"

pubspec.yaml

@@ -36,6 +36,7 @@ dependencies:
   cupertino_icons: ^1.0.8
   http: ^1.5.0
   shared_preferences: ^2.5.3
+  web: ^1.1.1
 
 dev_dependencies:
   flutter_test: