ci: deploy to GitHub Pages on push

Vite base path switches to /stackmind/ only for production builds so
local dev keeps serving from /. GitHub Actions workflow builds with
pnpm, uploads dist as a Pages artifact and deploys via
actions/deploy-pages.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

Author: kvaps

.github/workflows/deploy.yml

@@ -0,0 +1,44 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [master, main]
+  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: pnpm/action-setup@v4
+        with:
+          version: 10
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm build
+      - uses: actions/configure-pages@v5
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

vite.config.ts

@@ -2,7 +2,8 @@ import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
 import { fileURLToPath, URL } from 'node:url'
 
-export default defineConfig({
+export default defineConfig(({ command }) => ({
+  base: command === 'build' ? '/stackmind/' : '/',
   plugins: [vue()],
   resolve: {
     alias: {
@@ -12,4 +13,4 @@ export default defineConfig({
   server: {
     port: 5174,
   },
-})
+}))