build: add Pipeline GitHub Action workflow(s)

Signed-off-by: Vinayak Kulkarni <19776877+vinayakkulkarni@users.noreply.github.com>

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: '/'
+    schedule:
+      interval: daily
+    commit-message:
+      prefix: fix
+      prefix-development: chore
+      include: scope
+  - package-ecosystem: github-actions
+    directory: '/'
+    schedule:
+      interval: weekly
+    commit-message:
+      prefix: fix
+      prefix-development: chore
+      include: scope

.github/workflows/automerge.yml

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+name: 'Auto Merge PRs'
+
+on:
+  workflow_call:
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: write
+    steps:
+      - uses: fastify/github-action-merge-dependabot@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/builder.yml

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+name: 'Setup Docker Image(s)'
+
+on:
+  workflow_call:
+    inputs:
+      branch:
+        description: 'The branch for the workflow'
+        default: 'dev'
+        required: true
+        type: string
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository 🎉
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx 🏗
+        uses: docker/setup-buildx-action@v2
+        with:
+          buildkitd-flags: --debug
+
+      - name: Log in to the Container registry 🔐
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker 🙏🏽
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image 🦾
+        uses: docker/build-push-action@v3.1.1
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }},${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ inputs.branch }},${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/ci.yml

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+name: 'Continuous Integration'
+
+on:
+  workflow_call:
+
+permissions:
+  checks: write
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository ✨ (non-dependabot)
+        if: ${{ github.actor != 'dependabot[bot]' }}
+        uses: actions/checkout@v3
+
+      - name: Check out repository 🎉 (dependabot)
+        if: ${{ github.actor == 'dependabot[bot]' }}
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Setup node env 📦
+        uses: actions/setup-node@v3
+        with:
+          node-version: 10
+
+      - name: Install dependencies 🚀
+        run: npm i --prefer-offline --no-audit --omit=optional
+
+      - name: Run linter(s) 💅
+        uses: wearerequired/lint-action@v2
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          continue_on_error: false
+          git_name: github-actions[bot]
+          git_email: github-actions[bot]@users.noreply.github.com
+          auto_fix: false
+          prettier: true
+          prettier_extensions: js,cjs,ts,json
+
+      - name: Run hadolint 🐳
+        uses: hadolint/hadolint-action@v2.1.0
+        with:
+          dockerfile: Dockerfile
+          ignore: DL3003,DL3008
+
+      # - name: Run tests 🧪
+      #   run: npm run test

.github/workflows/pipeline.yml

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+name: 'The Pipeline'
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+    branches:
+      - main
+      - master
+
+jobs:
+  extract-branch:
+    name: 'Fetch branch'
+    runs-on: ubuntu-latest
+    outputs:
+      current_branch: ${{ steps.get-branch.outputs.current_branch }}
+    steps:
+      - name: Extract branch name 🕊
+        id: get-branch
+        run: echo "::set-output name=current_branch::${GITHUB_REF##*/}"
+  ci:
+    name: 'CI'
+    needs:
+      - extract-branch
+    uses: maptiler/tileserver-gl/.github/workflows/ci.yml@main
+  automerger:
+    name: 'Auto Merge Bot PRs'
+    needs:
+      - ci
+    if: ${{ github.event_name == 'pull_request' && github.event.pull_request.user.login == 'dependabot[bot]' }}
+    uses: maptiler/tileserver-gl/.github/workflows/automerger.yml@main
+  builder:
+    name: 'Build & Publish Docker Image(s)'
+    needs:
+      - extract-branch
+      - ci
+    if: ${{ github.event_name == 'push' }}
+    uses: maptiler/tileserver-gl/.github/workflows/builder.yml@main
+    with:
+      branch: ${{ needs.extract-branch.outputs.current_branch }}