chore: update actions/checkout to v2 (open-telemetry#806)

.github/workflows/unit-test.yml

@@ -9,18 +9,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        container: ["node:8", "node:10", "node:12", "node:14", "node:16"]
+        node: ["8", "10", "12", "14", "16"]
         include:
-          - container: "node:8"
+          - node: "8"
             lerna-extra-args: >-
               --ignore @opentelemetry/instrumentation-aws-sdk
               --ignore @opentelemetry/instrumentation-pino
-          - container: "node:10"
+          - node: "10"
             lerna-extra-args: >-
               --ignore @opentelemetry/instrumentation-pino
     runs-on: ubuntu-latest
-    container:
-      image: ${{ matrix.container }}
     services:
       memcached:
         image: memcached:1.6.9-alpine
@@ -97,7 +95,12 @@ jobs:
       CASSANDRA_PORT: 9042
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
       - name: Cache Dependencies
         uses: actions/cache@v2
         with:
@@ -110,22 +113,18 @@ jobs:
             plugins/node/*/node_modules
             plugins/web/*/node_modules
             propagators/*/node_modules
-          key: ${{ runner.os }}-${{ matrix.container }}-${{ hashFiles('**/package.json') }}
+          key: ${{ runner.os }}-${{ matrix.node }}-${{ hashFiles('**/package.json') }}
       - name: Legacy Peer Dependencies for npm 7
-        if: matrix.container == 'node:16'
+        if: matrix.node == '16'
         run: npm config set legacy-peer-deps=true
       - name: Install Root Dependencies
         run: npm install --ignore-scripts
-      - name: Fix npm cache permissions
-        run: |
-          chown -R 1001:121 "/github/home/.npm"
-          [ -e /__w/opentelemetry-js-contrib/opentelemetry-js-contrib/package-lock.json ] && chown 1001:121 /__w/opentelemetry-js-contrib/opentelemetry-js-contrib/package-lock.json
       - name: Bootstrap Dependencies
         run: npx lerna bootstrap --no-ci --hoist --nohoist='zone.js' --nohoist='mocha' --nohoist='ts-mocha'
       - name: Unit tests
         run: npm run test:ci:changed -- ${{ matrix.lerna-extra-args }}
       - name: Report Coverage
-        if: matrix.container == 'node:14'
+        if: matrix.node == '14'
         run: npm run codecov:ci:changed
   browser-tests:
     runs-on: ubuntu-latest
@@ -134,10 +133,12 @@ jobs:
     env:
       NPM_CONFIG_UNSAFE_PERM: true
     steps:
-      - name: Checkout
-        uses: actions/checkout@v1
       - name: Permission Setup
         run: sudo chmod -R 777 /github /__w
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
       - name: Cache Dependencies
         uses: actions/cache@v2
         with:
@@ -150,7 +151,7 @@ jobs:
             plugins/node/*/node_modules
             plugins/web/*/node_modules
             propagators/*/node_modules
-          key: ${{ runner.os }}-node:12-${{ hashFiles('**/package.json') }}
+          key: ${{ runner.os }}-browser-${{ hashFiles('**/package.json') }}
       - name: Install Root Dependencies
         run: npm install --ignore-scripts
       - name: Bootstrap Dependencies