add workflows to triage open-source issues and pulls (#67)

.github/workflows/triage-issue-comments.yml

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+name: Triage new issue comments
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  triage-issue-comments:
+    if: github.repository == 'github/docs'
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check if the event originated from a team member
+      uses: actions/github-script@v2.0.0
+      id: is-internal-contributor
+      with:
+        github-token: ${{secrets.GITHUB_TOKEN}}
+        result-encoding: string
+        script: |
+          const repo = context.payload.repository.name
+          const org = context.payload.repository.owner.login
+          const actor = context.actor
+          let collaboratorStatus = ''
+          try {
+            collaboratorStatus = await github.request('GET /repos/{owner}/{repo}/collaborators/{username}', {
+              owner: org,
+              repo: repo,
+              username: actor
+            })
+            console.log(`This issue was commented on by a Hubber.`)
+            return 'true'
+          } catch (error) {
+            console.log(`This issue was commented on by an external contributor.`)
+            return 'false'
+          }
+    - name: Label issues with new comments with 'triage'
+      uses: andymckay/labeler@v1.0.2
+      if: (steps.is-internal-contributor.outputs.result == 'false')
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        add-labels: "triage"
+    - name: Triage to project board
+      uses: konradpabjan/actions-add-new-issue-to-column@v1.1
+      with:
+        action-token: ${{ secrets.GITHUB_TOKEN }}
+        project-url: "https://github.com/github/docs/projects/1"
+        column-name: "Triage"

.github/workflows/triage-issues.yml

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+name: Triage new issues
+on:
+  issues:
+    types: [reopened, opened]
+
+jobs:
+  triage_issues:
+    if: github.repository == 'github/docs'
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Label new issues with 'triage'
+      uses: andymckay/labeler@v1.0.2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        add-labels: "triage"
+    - name: Triage to project board
+      uses: konradpabjan/actions-add-new-issue-to-column@v1.1
+      with:
+        action-token: ${{ secrets.GITHUB_TOKEN }}
+        project-url: "https://github.com/github/docs/projects/1"
+        column-name: "Triage"

.github/workflows/triage-pull-requests.yml

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+name: Triage new pull requests
+on:
+  pull_request:
+    types: [reopened, opened]
+
+jobs:
+  triage_issues:
+    if: github.repository == 'github/docs'
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Label new pull requests with 'triage'
+      uses: andymckay/labeler@v1.0.2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        add-labels: "triage"
+    - name: Triage to project board
+      uses: konradpabjan/actions-add-new-issue-to-column@v1.1
+      with:
+        action-token: ${{ secrets.GITHUB_TOKEN }}
+        project-url: "https://github.com/github/docs/projects/1"
+        column-name: "Triage"

.github/workflows/triage-stale-check.yml

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+name: Public Repo Stale Check
+on:
+  schedule:
+  - cron: "45 16 * * *"  # Run each day at 16:45 UTC / 8:45 PST
+
+jobs:
+  stale:
+    if: github.repository == 'github/docs'
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/stale@v3
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }} 
+        stale-pr-message: 'This PR is stale because it has been open 7 days with no activity and will be automatically closed in 3 days. To keep this PR open, update the PR by adding a comment or pushing a commit.'
+        days-before-stale: 7
+        days-before-close: 10
+        stale-pr-label: 'stale'