[E4E-30]: Add Github actions for PRs

.github/pr-branch-labeler.yml

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+# Apply label "staging"
+staging:
+  base: "staging"
+
+# Apply label "dev"
+dev:
+  base: "development"
+
+# Apply whatever comes after release/ as the label
+# E.g. Merging into 'release/1.0' will add the label '1.0'
+$1:
+  baseRegExp: "release[/](.*)"

.github/workflows/pr-labeler.yml

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+name: PR Branch Labeler
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  label_prs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Label PRs
+        uses: TheCleric/pr-branch-labeler@v3
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/pr-sync-approval.yml

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+name: Auto approval for sync PRs without conflicts
+on:
+  pull_request:
+    types: [opened]
+jobs:
+  approve_syncs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Approve sync PRs
+        uses: nrccua/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          label-list: sync
+          label-exclusion-list: conflicts,had conflicts,merge issues

.github/workflows/pr-testing.yml

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+name: Node Test for PRs
+
+on:
+  pull_request:
+    branches:
+      - development
+      - staging
+      - "release/*"
+      - main
+
+jobs:
+  test:
+    name: Install dependencies, test, and deploy a PR build
+    runs-on: ubuntu-latest
+    env:
+      aws_s3_bucket: ${{ secrets.AWS_S3_BUCKET }}-pr-${{ github.event.number }}
+    strategy:
+      matrix:
+        node: ["14"]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+      - name: Cache node modules
+        uses: actions/cache@v2
+        env:
+          cache-name: cache-node-modules
+        with:
+          path: |
+            ~/.npm
+            **/node_modules
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-
+            ${{ runner.os }}-
+      - run: npm i
+      - run: npm run test
+      - name: Build
+        run: npm run build
+      - uses: romeovs/[email protected]
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          lcov-file: ./build/reports/jest/lcov.info