Label potential missing changes

It is fairly common that changes in some files imply changes in other files.

As an example, modifying files in the src directory might need changes in the docs directory.

apiVersion: reviewpad.com/v0.0.4

labels:
  missing-specs:
    description: likely missing specs

rules:
  codeChangesImplySpecChanges:
    kind: patch
    description: Changes to src and not to spec
    spec: $hasFilePattern("src/**") && !$hasFilePattern("docs/**")

protectionGates:
  - name: checkForSpecs
    description: Check for specs
    patchRules:
      - rule: codeChangesImplySpecChanges
    actions:
      - $addLabel("missing-specs")

You can see this policy in the following pull request reviewpad/action-demo/#2.