Doesn't detect cyclic `needs`

[bytesnz]

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---

This doesn't seem to detect cyclic needs on the jobs.

name: cyclic-test
on:
  pull: {}
jobs:
  test:
    runs-on: ubuntu-latest
    needs:
      - test
    steps:
      - run: echo hello
  test1:
    runs-on: ubuntu-latest
    needs:
      - test2
    steps:
      - run: echo hello
  test2:
    runs-on: ubuntu-latest
    needs:
      - test1
    steps:
      - run: echo hello

[mpalmer]

Indeed it doesn't. Thanks for the minimal test case, that'll help evaluating a PR to fix.