Setup GitHub actions

Author: amarthadan

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: '/'
+    schedule:
+      interval: weekly
+      time: '11:00'
+    open-pull-requests-limit: 5
+    reviewers:
+      - amarthadan

.github/workflows/main.yml

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+name: Continuous Build
+
+on:
+  push:
+  pull_request:
+    branches:
+      - main
+    types: [opened, synchronize, reopened]
+
+env:
+  TARGET_NODE_VERSION: '14.17.1'
+
+jobs:
+  documentation:
+    name: Check documentation
+    runs-on: ubuntu-latest
+    # Don't run twice for a push within an internal PR
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+    steps:
+      - name: Clone Airseeker
+        uses: actions/checkout@v2
+      - name: Check hyperlinks
+        uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          config-file: .github/workflows/mlc_config.json
+
+  lint-build-test:
+    name: Lint, compile, test
+    runs-on: ubuntu-latest
+    # Don't run twice for a push within an internal PR
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+    steps:
+      - name: Clone Airseeker
+        uses: actions/checkout@v2
+      - name: Setup Node
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.TARGET_NODE_VERSION }}
+          cache: 'yarn'
+      - name: Install Dependencies
+        run: yarn install --frozen-lockfile
+      - name: Lint
+        run: yarn lint
+      - name: Compile
+        run: yarn build
+      - name: Test
+        run: yarn test
+
+  required-checks-passed:
+    name: All required checks passed
+    runs-on: ubuntu-latest
+    needs: [documentation, lint-build-test]
+    steps:
+      - run: exit 0

.github/workflows/mlc_config.json

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+{
+  "retryOn429": true,
+  "retryCount": 3,
+  "fallbackRetryDelay": "10s"
+}