chore(ci): basic ChatOps

.github/slash-command-dispatch.json

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+[
+  {
+    "command": "hold",
+    "permission": "write",
+    "issue_type": "pull-request"
+  },
+  {
+    "command": "unhold",
+    "permission": "write",
+    "issue_type": "pull-request"
+  },
+  {
+    "command": "lgtm",
+    "permission": "write",
+    "issue_type": "pull-request"
+  }
+]

.github/workflows/ops-slash-command-dispatch.yml

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+name: Slash Command Dispatch
+on:
+  issue_comment:
+    # Type "edited" added here for test purposes. Where possible, avoid
+    # using to prevent processing unnecessary events.
+    types: [created, edited]
+
+jobs:
+  slashCommandDispatch:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: read
+      issues: read
+    steps:
+
+      # Advanced JSON configuration from file
+      # (These commands do not do anything and are just a reference example)
+      - name: Slash Command Dispatch (JSON file)
+        uses: peter-evans/slash-command-dispatch@v5
+        id: scd
+        with:
+          token: ${{ secrets.PAT_SLASH_COMMAND_DISPATCH }}
+          reactions: false
+          config-from-file: .github/slash-command-dispatch.json
+
+      - name: Edit comment with error message
+        if: steps.scd.outputs.error-message
+        uses: peter-evans/create-or-update-comment@v5
+        with:
+          comment-id: ${{ github.event.comment.id }}
+          body: |
+            > ${{ steps.scd.outputs.error-message }}

.github/workflows/ops-slash-command-hold.yml

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+name: Handle /hold command
+
+on:
+  repository_dispatch:
+    types: [hold-command]
+
+jobs:
+  handle:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/github-script@v8
+        with:
+          script: |
+            github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              labels: ['pr-reviews/hold']
+            })

.github/workflows/ops-slash-command-unhold.yml

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+name: Handle /unhold command
+
+on:
+  repository_dispatch:
+    types: [unhold-command]
+
+jobs:
+  handle:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/github-script@v8
+        with:
+          script: |
+            github.rest.issues.removeLabel({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              name: 'pr-reviews/hold'
+            })