Add a Codespell action

[peternewman]

Although looking at your other actions, maybe you'd prefer pre-commit which we also support?

To make this clean either fo or ideally that specific line instance needs ignoring too.

[sourcery-ai[bot]]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	46.94 ⛔	46.94 ⛔	0.00
Method Length	137.00 😞	137.00 😞	0.00
Working memory	1.75 ⭐	1.75 ⭐	0.00
Quality	25.89% 😞	25.89% 😞	0.00%

Other metrics	Before	After	Change
Lines	761	761	0

Changed files	Quality Before	Quality After	Quality Change
shtab/init.py	25.89% 😞	25.89% 😞	0.00%

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
shtab/init.py	get_bash_commands	78 ⛔	589 ⛔		1.22% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_zsh	62 ⛔	900 ⛔		2.38% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_tcsh	53 ⛔	470 ⛔		4.99% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_bash	2 ⭐	106 🙂	11 😞	64.30% 🙂	Extract out complex expressions
shtab/init.py	add_argument_to	4 ⭐	89 🙂	11 😞	64.67% 🙂	Extract out complex expressions

Legend and Explanation

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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