chore: setup dependabot and GHA CI

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    versioning-strategy: increase
+    schedule:
+      interval: "daily"
+      time: "09:00"
+      timezone: "Europe/Berlin"
+    commit-message:
+      prefix: "deps"
+      prefix-development: "deps(dev)"
+    reviewers:
+      - "bajtos"
+      - "juliangruber"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "09:00"
+      timezone: "Europe/Berlin"
+    commit-message:
+      prefix: "ci"
+    reviewers:
+      - "bajtos"
+      - "juliangruber"
+  - package-ecosystem: "docker"
+    directories:
+      - "/"
+    schedule:
+      interval: "daily"
+      time: "15:00"
+      timezone: "Europe/Berlin"

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test-indexer:
+    runs-on: ubuntu-latest
+    env:
+      NPM_CONFIG_WORKSPACE: indexer
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: npm ci
+      - run: npm test
+
+  lint-all:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: npm ci
+      - run: npm run lint

.github/workflows/dependabot-auto-approve-always.yml

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+name: Dependabot auto-approve updates
+on: pull_request
+
+permissions:
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    strategy:
+      matrix:
+        dependencyStartsWith:
+          - spark-evaluate
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Approve a PR
+        if: ${{startsWith(steps.metadata.outputs.dependency-names, matrix.dependencyStartsWith)}}
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/dependabot-auto-approve-minor.yml

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+name: Dependabot auto-approve minor updates
+on: pull_request
+
+permissions:
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    strategy:
+      matrix:
+        dependencyStartsWith:
+          - '@sentry/'
+          - standard
+          - typescript
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Approve a PR
+        if: ${{startsWith(steps.metadata.outputs.dependency-names, matrix.dependencyStartsWith) && (steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor')}}
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/dependabot-auto-merge.yml

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+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}