ci: add GitHub Pages deployment workflow for web app

Adds automated deployment to GitHub Pages with custom domain app.hapi.run, and updates vite.config.ts to support dynamic base URL via VITE_BASE_URL environment variable

.github/workflows/webapp.yml

@@ -0,0 +1,48 @@
+name: Deploy Web App to GitHub Pages
+
+on:
+    push:
+        branches:
+            - main
+        paths:
+            - 'web/**'
+            - '.github/workflows/webapp.yml'
+    workflow_dispatch:
+
+permissions:
+    contents: read
+    pages: write
+    id-token: write
+
+concurrency:
+    group: pages
+    cancel-in-progress: true
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: oven-sh/setup-bun@v2
+            - run: bun install
+            - name: Build web app
+              run: bun run --cwd web build
+            - name: Add CNAME for custom domain
+              run: echo "app.hapi.run" > web/dist/CNAME
+            - name: Setup Pages
+              uses: actions/configure-pages@v5
+            - name: Upload artifact
+              uses: actions/upload-pages-artifact@v3
+              with:
+                  path: web/dist
+
+    deploy:
+        needs: build
+        runs-on: ubuntu-latest
+        environment:
+            name: github-pages
+            url: ${{ steps.deployment.outputs.page_url }}
+        steps:
+            - name: Deploy to GitHub Pages
+              id: deployment
+              uses: actions/deploy-pages@v4

web/vite.config.ts

@@ -3,6 +3,8 @@ import react from '@vitejs/plugin-react'
 import { VitePWA } from 'vite-plugin-pwa'
 import { resolve } from 'node:path'
 
+const base = process.env.VITE_BASE_URL || '/'
+
 export default defineConfig({
     server: {
         host: true,
@@ -31,8 +33,8 @@ export default defineConfig({
                 background_color: '#ffffff',
                 display: 'standalone',
                 orientation: 'portrait',
-                scope: '/',
-                start_url: '/',
+                scope: base,
+                start_url: base,
                 icons: [
                     {
                         src: 'pwa-64x64.png',
@@ -126,7 +128,7 @@ export default defineConfig({
             }
         })
     ],
-    base: '/',
+    base,
     resolve: {
         alias: {
             '@': resolve(__dirname, 'src')