Add skip_install to static analysis sections of tox.ini

[jpy-git]

Brief summary of the change made

Very simple PR. We are currently installing the sqlfluff package into our linting,doclinting, and mypy tox environments. These are all static analysis tools and hence don't need the package installed to run.
We therefore add skip_install=True to these sections.
Approach is used in many other projects (e.g. flake8 https://github.com/PyCQA/flake8/blob/main/tox.ini)

Are there any other side effects of this change that we should be aware of?

No as mentioned above these tox environments aren't actually touching the package.

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/dialects (note YML files can be auto generated with python test/generate_parse_fixture_yml.py or by running tox locally).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[codecov]

Codecov Report

Merging #1851 (b7ef2f0) into main (f038781) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main     #1851   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          139       139           
  Lines         9946      9946           
=========================================
  Hits          9946      9946           

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