Reintroduce Dependabot for just GitHub Actions

[teolemon]

Reintroduce Dependabot for just GitHub Actions

version: 2
updates:
  - package-ecosystem: "pip"
    directory: "/" # Location of package manifests
    schedule:
      interval: "monthly"
    commit-message:
      prefix: "chore"
      include: "scope"
    open-pull-requests-limit: 30
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "monthly"
    commit-message:
      prefix: "chore"
      include: "scope"
    open-pull-requests-limit: 30
  - package-ecosystem: "docker"
    directory: "/"
    schedule:
      interval: "monthly"
    commit-message:
      prefix: "chore"
      include: "scope"
    open-pull-requests-limit: 30

[raphael0202]

With @alexgarel we disabled dependabot on purpose, as it introduced a lot of open pull requests, and as every version upgrade introduce possibly unexpected breaking changes.

[teolemon]

I'm not talking about docker or pip updates, just GitHub actions (like crowdin)

[alexgarel]

Yes I think it's ok to add it for github actions.