Add a workflow to update test262 tests weekly (#12523)

* chore: draft update parser tests workflow

* Build babel parser

* chore: use Babel bot as git user name

* use babel-bot token

* refactor: use actions/github-script

* rename

.github/workflows/update-parser-tests.yml

@@ -0,0 +1,83 @@
+name: Update Test262 parser tests
+env:
+  YARN_ENABLE_SCRIPTS: false # disable post-install scripts
+  YARN_NODE_LINKER: pnp # use pnp linker for better performance
+on:
+  workflow_dispatch:
+    inputs: {}
+  schedule:
+    - cron: "0 0 * * 5"
+
+jobs:
+  createPullRequest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2
+        with:
+          repository: tc39/test262
+          path: build/test262
+      - name: Use Node.js latest
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: "*"
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
+      - uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: yarn-${{ hashFiles('yarn.lock') }}
+          restore-keys: |
+            yarn-
+      - name: Get latest test262 version
+        id: test262
+        run: echo "::set-output name=sha1::$(sh ./scripts/parser-tests/get-test262-version.sh)"
+      - name: Update test262 commit
+        run: |
+          echo ${{ steps.test262.outputs.sha1 }} | ./scripts/parser-tests/bump-test262-version.sh
+      - name: Build babel parser
+        run: |
+          yarn install --immutable --skip-builds
+          yarn gulp build-rollup
+      - name: Update test262 allow list
+        run: |
+          make test-test262-update-allowlist
+      - name: Commit changes
+        run: |
+          git config user.name "Babel Bot"
+          git config user.email "Babel Bot <babel-bot@users.noreply.github.com>"
+          git checkout -b update-test262-parser
+          git commit -am "chore: update test262 to ${{ steps.test262.outputs.sha1 }}"
+          git push --force origin update-test262-parser
+      - name: Create Pull Request
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{ secrets.BOT_TOKEN }}
+          script: |
+            const base = process.env.GITHUB_REF.replace("/ref/heads/", "");
+            const { data: prs } = await github.pulls.list({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              head: "update-test262-parser",
+              base: base
+            });
+            if (prs.length === 0) {
+              const { data: pr } = await github.pulls.create({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                head: "update-test262-parser",
+                base: base,
+                maintainer_can_modify: true,
+                title: "Update test262",
+                body: "Update test262 to [${{ steps.test262.outputs.sha1 }}](https://github.com/tc39/test262/commit/${{ steps.test262.outputs.sha1 }}).",
+              });
+
+              github.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr.number,
+                labels: ["area: test262", "repo automation 🤖"]
+              })
+            }

scripts/parser-tests/bump-test262-version.sh

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+#!/bin/sh
+# read given commit SHA1 from stdin, update to TEST262_COMMIT in Makefile
+# usage:
+# sh ./scripts/parser-tests/get-test262-version.sh | sh ./scripts/parser-tests/bump-test262-version.sh
+
+set -e
+perl -i -pe 's/^TEST262_COMMIT.+$/TEST262_COMMIT = '$(cat)'/' ./Makefile

scripts/parser-tests/get-test262-version.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+# Get the latest HEAD of tc39/test262
+# usage:
+# sh ./scripts/parser-tests/bump-test262-version.sh
+
+set -e
+export GIT_DIR=./build/test262/.git
+git fetch -q origin HEAD
+git rev-parse FETCH_HEAD