Incident freeze and unfreeze

During an incident, merges must stop in minutes and be restored just as fast, with both directions on the record. Two profile files and one dispatch workflow do it. The freeze:

# .github/profiles/freeze.yml
_incident: INC-4471

rulesets:
  - name: incident freeze
    target: push
    enforcement: active
    rules:
      - type: file_path_restriction
        parameters:
          restricted_file_paths: ["**/*"]

interaction_limits:
  limit: collaborators_only
  expiry: one_day

And the recovery:

# .github/profiles/recover.yml
rulesets:
  - name: incident freeze
    target: push
    enforcement: disabled
    rules:
      - type: file_path_restriction
        parameters:
          restricted_file_paths: ["**/*"]

interaction_limits: null

name: Incident response
on:
  workflow_dispatch:
    inputs:
      profile:
        type: choice
        options: [freeze, recover]

permissions:
  contents: read

jobs:
  incident:
    runs-on: ubuntu-latest
    environment: incident-response
    steps:
      - uses: actions/checkout@v7
      - uses: Vivswan/github-settings-as-code@v2 # x-release-please-major
        with:
          token: ${{ secrets.INCIDENT_TOKEN }}
          settings-file: .github/profiles/${{ inputs.profile }}.yml

The recovery file re-declares the same ruleset as enforcement: disabled on purpose: undeclared rulesets are kept by default, so a recovery file that simply omitted it would leave the freeze in place. The interaction limit is the failsafe in the other direction, since it self-expires after a day even if nobody runs the recover profile. One scope constraint: GitHub limits push rulesets to private and internal repositories (and their fork networks), so on a public repository this profile's brake is the interaction limit alone; freeze a public repository with a branch ruleset instead, targeting ~ALL with an update rule. Both runs are visible dispatches by a named actor on a gated environment: the audit trail comes free.