Migrate from Gitea Actions to GitHub Actions

.gitea/workflows/ci.yml

@@ -1,22 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches: [master]
-  pull_request:
-    branches: [master]
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Set up Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 22
-      - name: Install dependencies
-        run: npm ci
-      - name: Run checks
-        run: npm run check

.gitea/workflows/renovate.yml

@@ -1,18 +0,0 @@
-name: RenovateBot
-on:
-  schedule:
-    - cron: "@daily"
-
-jobs:
-  renovate:
-    container: ghcr.io/renovatebot/renovate:40-full
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Run Renovate updates
-        run: renovate
-        env:
-          RENOVATE_CONFIG_FILE: renovate.config.cjs
-          RENOVATE_REPOSITORIES: ${{ gitea.repository }}
-          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}