Also add to https://github.com/zsh-users/zsh-completions

Related/Similar #2151

https://github.com/AdoptOpenJDK/openjdk-build/blob/282058709909733381464dcb67b7f0d13dca4e13/pipelines/build/common/openjdk_build_pipeline.groovy#L226

The function for sign build has some hardcoded values which could be parameterized to make the scripts more portable.

Lables

https://github.com/AdoptOpenJDK/openjdk-build/blob/282058709909733381464dcb67b7f0d13dca

It's very common for people to create a venv or .venv folder, using virtualenv or python -m venv, alongside the requirements.txt file for Python

    'venv requirements.txt'       # virtualenv (python)
    '.venv requirements.txt'      # virtualenv (python)

Currently, if I run bake command when the Bakefile is empty, the error message seems very scary:

Traceback (most recent call last):
  File "/home/redowan/.local/share/virtualenvs/flask-template-wBuRwttx/bin/bake", line 8, in <module>
    sys.exit(entrypoint())
  File "/home/redowan/.local/share/virtualenvs/flask-template-wBuRwttx/lib/python3.7/site-packages/click/core.py", line 764,