name: Keep caches warm

# **What it does**:
#   Makes sure the caching of ./node_modules and ./.next is kept warm
#   for making other pull requests faster.
#   We also use this workflow to precompute other things so that the
#   actions cache is warmed up with data available during deployment
#   actions. When you use actions/cache within a run on `main`
#   what gets saved can be used by other pull requests. But it's
#   also so that when we make preview or production deployments,
#   we can just rely on the cache to already be warmed up.
# **Why we have it**:
#   A PR workflow that depends on caching can't reuse a
#   cached artifact acorss PRs unless it also runs on `main`.
# **Who does it impact**: Docs engineering, open-source engineering contributors.

on:
  workflow_dispatch:
  push:
    branches:
      - main

permissions:
  contents: read

jobs:
  keep-caches-warm:
    if: github.repository == 'github/docs-internal' || github.repository == 'github/docs'
    runs-on: ${{ fromJSON('["ubuntu-latest", "ubuntu-20.04-xl"]')[github.repository == 'github/docs-internal'] }}
    steps:
      - name: Check out repo
        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1

      - uses: ./.github/actions/node-npm-setup

      - uses: ./.github/actions/cache-nextjs

      - name: Build
        run: npm run build

      - uses: ./.github/actions/warmup-remotejson-cache
        if: github.repository == 'github/docs-internal'

      - uses: ./.github/actions/precompute-pageinfo
        if: github.repository == 'github/docs-internal'

      - uses: ./.github/actions/slack-alert
        if: ${{ failure() && github.event_name != 'workflow_dispatch' }}
        with:
          slack_channel_id: ${{ secrets.DOCS_ALERTS_SLACK_CHANNEL_ID }}
          slack_token: ${{ secrets.SLACK_DOCS_BOT_TOKEN }}