[skip ci] add manual e2e requirements

.github/workflows/code/create-checklist-comment.js

+module.exports = async ({github, context}) => {
+  const pathToChecklist = './e2e/checklist.md'
+  const fs = require('fs')
+  const { promisify } = require('util')
+  const asyncReadFile = promisify(fs.readFile)
+  const text = await asyncReadFile(pathToChecklist, 'utf-8')
+  github.rest.issues.createComment({
+    issue_number: context.issue.number,
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    body: text
+  })
+}

.github/workflows/code/minimise-all-checklist-comments.js

+module.exports = async ({github, context}) => {
+  
+  const querySpec = `query($owner:String!, $name:String!, $issueNumber:Int!, $cursor:String) {
+    repository(owner: $owner, name: $name) {
+      pullRequest(number: $issueNumber) {
+        title
+        comments(first:50, after: $cursor){
+          totalCount
+          edges{
+            node {
+              author{
+                login
+              }
+              bodyText,
+              isMinimized,
+              id
+            }
+            cursor
+          }
+        }
+      }
+    }
+  }`
+  const variables = {
+    owner: context.repo.owner,
+    name: context.repo.repo,
+    issueNumber: context.issue.number,
+  }
+  const results = []
+  let cursor, totalCount = 0
+
+  const query = async ({ cursor }) => {
+    const resp = await github.graphql(querySpec, {
+      ...variables,
+      cursor
+    })
+    const {totalCount = 0, edges = [] } = (() => {
+      try {
+        return resp.repository.pullRequest.comments
+      } catch (e) {
+        console.warn('accessor error', e)
+        return {}
+      }
+    })()
+    return {
+      results: edges.map(edge => edge.node),
+      cursor: (() => {
+        try {
+          return edges[edges.length - 1].cursor
+        } catch (e) {
+          return null
+        }
+      })(),
+      totalCount
+    }
+  }
+
+  do {
+    const {
+      results: queryResults,
+      cursor: queryCursor,
+      totalCount: queryTotalCount
+    } = await query({ cursor })
+    results.push(...queryResults)
+    cursor = queryCursor
+    totalCount = queryTotalCount
+  } while(!!cursor && totalCount > results.length)
+
+  const commentsToMinimize = results.filter(res => res.author.login === 'github-actions' && !res.isMinimized)
+
+  const mutation = `mutation($minComInput: MinimizeCommentInput!) {
+    minimizeComment(input: $minComInput) {
+      clientMutationId
+      minimizedComment{
+        minimizedReason
+        viewerCanMinimize
+        isMinimized
+      }
+    }
+  }`
+
+  console.log(`Minimizing ${commentsToMinimize.length} previous checklist comments.`)
+
+  for (const result of results) {
+    const mutationVariable = {
+      "minComInput": {
+        "subjectId": result.id,
+        "classifier": "OUTDATED",
+        "clientMutationId": "gha"
+      }
+    }
+    await github.graphql(mutation, mutationVariable)
+  }
+}

.github/workflows/manual_e2e.yml

+name: '[manual-e2e]'
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  hide_previous_if_exists:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: 'master'
+    - uses: actions/github-script@v5
+      with:
+        script: |
+          const script = require('./.github/workflows/code/minimise-all-checklist-comments.js')
+          await script({github, context})
+          
+  add_e2e_checklist:
+    needs: hide_previous_if_exists
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: 'master'
+    - name: 'Add checklist comment'
+      uses: actions/github-script@v5
+      with:
+        script: |
+          const script = require('./.github/workflows/code/create-checklist-comment.js')
+          await script({github, context})