Add the PR cleaner workflow (AliceO2Group#8199)

Author: ktf

.github/workflows/clean-test.yml

@@ -0,0 +1,46 @@
+---
+name: Clean PR checks
+
+'on':
+  workflow_dispatch:
+    inputs:
+      pr:
+        description: PR number in this repo to be cleaned
+        type: string   # can't use number here
+        required: true
+      message:
+        description: Human-readable message displayed on the new pending status
+        type: string
+        required: false
+        default: ''
+
+      # Warning: GitHub limits the total number of inputs to 10, so a maximum of
+      # 8 checks is allowed here!
+      # Warning: the check_* keys are magic and must consist of the string
+      # "check_" followed by the applicable check name exactly. The
+      # "description" field is only the human-readable label for the input.
+      'check_build/O2Physics/o2/macOS-arm':
+        description: build/O2Physics/o2/macOS-arm
+        type: boolean
+        default: true
+
+      'check_build/O2Physics/o2':
+        description: build/O2Physics/o2
+        type: boolean
+        default: true
+
+permissions: {}
+
+jobs:
+  clean:
+    name: Clean PR checks
+    uses: alisw/ali-bot/.github/workflows/clean-pr-checks.yml@master
+    with:
+      owner: ${{ github.event.repository.owner.login }}
+      repo: ${{ github.event.repository.name }}
+      pr: ${{ github.event.inputs.pr }}
+      message: ${{ github.event.inputs.message }}
+      checks: ${{ toJSON(github.event.inputs) }}
+    permissions:
+      pull-requests: read  # to get last commit for pr (octokit/graphql-action)
+      statuses: write      # for set-github-status