add auto-readme workflow

Author: Matt Calhoun

.github/workflows/auto-readme.yml

@@ -0,0 +1,75 @@
+name: "auto-readme"
+on:
+  workflow_dispatch: {}
+
+  ## Added pull_request to register workflow from the PR.
+  ## Read more https://stackoverflow.com/questions/63362126/github-actions-how-to-run-a-workflow-created-on-a-non-master-branch-from-the-wo
+  pull_request:
+    branches-ignore: ["*"]
+
+  schedule:
+    # Example of job definition:
+    # .---------------- minute (0 - 59)
+    # |  .------------- hour (0 - 23)
+    # |  |  .---------- day of month (1 - 31)
+    # |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
+    # |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
+    # |  |  |  |  |
+    # *  *  *  *  * user-name command to be executed
+
+    # Update README.md nightly at 4am UTC
+    - cron: "0 4 * * *"
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Find default branch name
+        id: defaultBranch
+        shell: bash
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        run: |
+          default_branch=$(gh repo view --json defaultBranchRef --jq .defaultBranchRef.name)
+          printf "::set-output name=defaultBranch::%s\n" "${default_branch}"
+          printf "defaultBranchRef.name=%s\n" "${default_branch}"
+
+      - name: Update readme
+        shell: bash
+        id: update
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          DEF: "${{ steps.defaultBranch.outputs.defaultBranch }}"
+        run: |
+          make init
+          make readme/build
+          # Ignore changes if they are only whitespace
+          if ! git diff --quiet README.md && git diff --ignore-all-space --ignore-blank-lines --quiet README.md; then
+            git restore README.md
+            echo Ignoring whitespace-only changes in README
+          fi
+
+      - name: Create Pull Request
+        # This action will not create or change a pull request if there are no changes to make.
+        # If a PR of the auto-update/readme branch is open, this action will just update it, not create a new PR.
+        uses: cloudposse/actions/github/create-pull-request@0.30.0
+        with:
+          token: ${{ secrets.PUBLIC_REPO_ACCESS_TOKEN }}
+          commit-message: Update README.md and docs
+          title: Update README.md and docs
+          body: |-
+            ## what
+            This is an auto-generated PR that updates the README.md and docs
+
+            ## why
+            To have most recent changes of README.md and doc from origin templates
+
+          branch: auto-update/readme
+          base: ${{ steps.defaultBranch.outputs.defaultBranch }}
+          delete-branch: true
+          labels: |
+            auto-update
+            no-release
+            readme