chore: add .degitignore, dependabot.yml, and CI workflow

Author: dean-journeyapps

.degitignore

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+# GitHub Actions and workflows
+.github/
+
+# Development files
+.vscode/
+.idea/
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+    open-pull-requests-limit: 10
+    reviewers:
+      - "dean-journeyapps"
+      - "joshua-journey-apps"
+      - "michaelbarnes"
+    ignore:
+      # Ignore major version updates for critical deps
+      - dependency-name: "react"
+        update-types: ["version-update:semver-major"]
+      - dependency-name: "react-dom"
+        update-types: ["version-update:semver-major"]
+    # Allow security updates for all dependencies
+    allow:
+      - dependency-type: "all"
+    groups:
+      react-ecosystem:
+        patterns:
+          - "react*"
+          - "@types/react*"
+      build-tools:
+        patterns:
+          - "webpack*"
+          - "babel*"
+          - "eslint*"
+          - "vite*"
+      powersync:
+        patterns:
+          - "@powersync/*"
+          - "powersync*"
+      testing:
+        patterns:
+          - "jest*"
+          - "@testing-library/*"
+          - "vitest*"

.github/pull_request_template.md

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+## Description
+
+## Work Done
+
+## How to Test

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+          cache: 'pnpm'
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      - name: Run linting
+        run: pnpm run lint
+      - name: Run type checking
+        run: pnpm run type-check
+      - name: Run tests
+        run: pnpm test
+      - name: Run build
+        run: pnpm run build