Add configurable pre-deploy actions

[onlinerj]

Summary

• parse repeatable [[tool.robotpy.deploy]] actions from pyproject.toml
• run configured commands locally before uploading robot code
• stop on required command failures and continue after optional failures
• validate malformed action configuration and document the new syntax
• preserve --no-install for projects whose pyproject.toml has no RobotPy table

Addresses robotpy/mostrobotpy#257.

Verification

• .venv/bin/python -m pytest — 87 passed
• .venv/bin/python -m mypy --show-column-numbers robotpy_installer — no issues in 21 source files
• .venv/bin/python -m black --check --diff . — passed
• required and optional failure paths are covered by unit tests

Evidence

Before: the issue specification and unimplemented configuration:

After: the corrected implementation, including the review-requested --no-install regression coverage:

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve the --no-install escape hatch

When --no-install is used in a project with an ordinary pyproject.toml that lacks [tool.robotpy], this unconditional load raises PyprojectError before the no_install branch is reached, so deployment now aborts. Previously --no-install deliberately bypassed parsing the file—and the existing error message explicitly recommends that flag—so pre-deploy discovery needs to tolerate a missing RobotPy section or retain the bypass when installation is disabled.

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[onlinerj]

I addressed the CI formatting failure and the review finding about preserving the --no-install escape hatch in 9204703. The branch now passes Black, mypy, and all 87 tests, including a regression test for an unrelated pyproject.toml without [tool.robotpy]. Would you be open to reopening this PR, or would you prefer a different implementation direction?