A custom YAML tag for referencing environment variables in YAML files.
Install `PyYAML` and the `pyyaml_env_tag` package with pip:
```bash
pip install pyyaml pyyaml_env_tag
```
To enable the tag, import and add the `construct_env_tag` constructor to your
YAML
loader of choice.
```python
import yaml
from yaml_env_tag import...
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