Update outdated dependencies issue automatically via GitHub Actions

outdated-dependencies.yml

name: Outdated dependencies

on:
  schedule:
    - cron: "0 3 * * *"
  workflow_dispatch:

jobs:
  npm:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: sudo npm install -g npm@latest
      - run: npm ci
      - name: Output outdated info
        run: |
          cat <<EOF > npm_outdated.txt
          <details open>
          <summary><code>npm outdated --long</code></summary>
          <pre><code>$(npm outdated --long)
          </code></pre>
          </details>

          Note: This issue should not be closed and aims to share outdated packages.

          Updated: _$(date)_ (by **${GITHUB_ACTOR}**)
          EOF
      - run: gh issue edit "${ISSUE_ID}" --body-file npm_outdated.txt
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          ISSUE_ID: ***

  gem:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: ruby/setup-ruby@v1
      - name: Output outdated info
        run: |
          set +o pipefail
          output=$(bundle outdated | grep -v -E '^(Fetching|Resolving)' | grep -v -E '^$')

          cat <<EOF > bundle_outdated.txt
          <details open>
          <summary><code>bundle outdated</code></summary>
          <pre><code>${output}
          </code></pre>
          </details>

          Note: This issue should not be closed and aims to share outdated packages.

          Updated: _$(date)_ (by **${GITHUB_ACTOR}**)
          EOF
      - run: gh issue edit "${ISSUE_ID}" --body-file bundle_outdated.txt
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          ISSUE_ID: *** 

Use https://github.com/juliangruber/read-file-action to process a multi-line body.

gh 1.8.0 supports --body-file flag, so read-file-action is no longer needed.