Initial import of check_labels action

.travis.yml

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+language: python
+python:
+  - "3.8"
+  - "3.8-dev"
+  - "nightly"
+jobs:
+  allow_failures:
+  - python: "nightly"
+# command to install dependencies
+install:
+  - pip install -r requirements.txt
+  - pip install pytest pytest-cov codecov pylint flake8
+# command to run tests
+script:
+  - flake8 check_labels.py
+  - pylint check_labels.py
+  - pytest
+after_success:
+  - codecov

Dockerfile

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+FROM python:3.8-alpine
+
+COPY requirements.txt /tmp/requirements.txt
+RUN pip3 install -r /tmp/requirements.txt
+
+COPY check_labels.py /check_labels.py
+
+ENTRYPOINT ["/check_labels.py"]

README.md

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+Check Labels Action
+===================
+
+This action checks the labels of a Pull Request and will succeed or fail based
+on the configuration.
+
+Inputs
+------
+
+### `access_token`
+An optional [personal access token], required for private repositories and to
+decrease rate limiting.
+
+[personal access token]: https://github.com/settings/tokens
+
+### `set_labels`
+Comma-separated list of labels required to be set. Optional. Globing syntax is
+possible for the label name, as defined in [fnmatch].
+
+### `unset_labels`
+Comma-separated list of labels required not to be set. Optional. Globing syntax
+is possible for the label name, as defined in [fnmatch].
+
+### `cond_labels`
+Comma-separated list of (label,condition) tuples for labels introducing a
+condition. Optional. Globing syntax is possible for the label name, as defined
+in [fnmatch].
+
+#### Supported conditions
+- `review.approvals>x`: If the label is set in the Pull Request it requires more
+  than `x` approving reviews for the action to succeed
+
+[fnmatch]: https://docs.python.org/3/library/fnmatch.html
+
+# Examples
+
+We recommend the following workflow triggers:
+
+```yml
+on:
+  pull_request:
+    types: [opened, reopened, labeled, unlabeled]
+  pull_request_review:
+    types: [submitted, dismissed]
+```
+
+The action will fail if "REQUIRE" and "MANDATORY" are not set, if any label
+starting with "INVALID" is set, or if "NEEDS >1 ACK" is set, but the PR only has
+one or no approval:
+
+```yml
+uses: RIOT-OS/[email protected]
+with:
+    access_token: '${{ secrets.GITHUB_ACCESS_TOKEN }}'
+    set_labels: 'REQUIRE, MANDATORY'
+    unset_labels: 'INVALID*'
+    cond_labels: '(NEEDS >1 ACK,review.approvals > 1)'
+```

action.yml

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+name: 'Check Pull Request Labels'
+author: 'Martine S. Lenders'
+description: 'Checks if certain labels are set or not set and allows conditions'
+inputs:
+  set_labels:
+    description: 'List of labels required to be set'
+    required: false
+    default: ''
+  unset_labels:
+    description: 'List of labels required not to be set'
+    required: false
+    default: ''
+  cond_labels:
+    description: 'List of (label,condition) tuples for labels introducing a condition'
+    required: false
+    default: ''
+  access_token:
+    description: 'A GitHub personal access tokens for private repositories'
+    required: false
+    default: ''
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.set_labels }}
+    - ${{ inputs.unset_labels }}
+    - ${{ inputs.cond_labels }}