Add GitHub action for weekly preview OpenAPI docs refresh PR.

.github/workflows/create-preview-openapidocs-pr-workflow.yml

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+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+# This is a basic workflow to help you get started with Actions
+
+name: "Create Weekly Preview OpenAPI Docs Refresh PR"
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the main branch
+on:
+  push:
+    branches:
+      - 'WeeklyPreviewRefresh/*'
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  createOpenApiDocsPR:
+    if: github.event_name == 'push' && contains(toJson(github.event.commits), '[run ci]') && !contains(toJson(github.event.commits), 'NO_CI') && !contains(toJson(github.event.commits), '[ci skip]') && !contains(toJson(github.event.commits), '[skip ci]')
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    - name: Configure User
+      run: |
+         git config --global user.email "GraphTooling@service.microsoft.com"
+         git config --global user.name "Microsoft Graph DevX Tooling"
+
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: List Directory
+      run: |
+        echo $GITHUB_WORKSPACE
+        ls -lsa $GITHUB_WORKSPACE
+        ls -lsa $GITHUB_WORKSPACE/tools
+
+    # Create a pull request [1]
+    - name: Create PR using the GitHub REST API via hub
+      shell: bash
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        MESSAGE_TITLE: Weekly Preview OpenAPI Docs Refresh
+        MESSAGE_BODY: "This pull request was automatically created by the GitHub Action,\n\n Contains OpenApi Docs Updates from Graph Explorer API (DevX API)"
+        REVIEWERS: peombwa,ddyett,timayabi2020,mairissi,shemogumbe
+        ASSIGNEDTO: peombwa
+        LABELS: generated
+        BASE: dev
+        HEAD: ${{steps.create_branch.outputs.branch}}
+      run: |
+        curl -fsSL https://github.com/github/hub/raw/master/script/get | bash -s 2.14.1
+        bin/hub pull-request -b "$BASE" -h "$HEAD" -m "$MESSAGE_TITLE" -m "$MESSAGE_BODY" -r "$REVIEWERS" -a "$ASSIGNEDTO" -l "$LABELS"
+# References
+# [0] https://help.github.com/en/actions/configuring-and-managing-workflows/using-environment-variables
+# [1] https://hub.github.com/hub-pull-request.1.html
+# https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token