feat: added postinstall hook

[jdx]

Fixes #1014

[github-actions]

Package	Line Rate	Complexity	Health
src.backend	65%	0	➖
src	87%	0	✔
src.cli	80%	0	✔
src.cli.alias	89%	0	✔
src.cli.args	97%	0	✔
src.cli.backends	95%	0	✔
src.cli.cache	88%	0	✔
src.cli.config	93%	0	✔
src.cli.direnv	80%	0	✔
src.cli.generate	87%	0	✔
src.cli.plugins	84%	0	✔
src.cli.settings	94%	0	✔
src.cli.sync	56%	0	➖
src.cli.tasks	74%	0	➖
src.config.config_file	85%	0	✔
src.config	86%	0	✔
src.plugins	80%	0	✔
src.plugins.core	55%	0	➖
src.shell	98%	0	✔
src.toolset	88%	0	✔
src.ui	64%	0	➖
Summary	79% (14945 / 18800)	0	✔

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.16%	✅ 23.08%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6cb1c60)	18790	14968	79.66%
Head commit (6f3242e)	18800 (+10)	14945 (-23)	79.49% (-0.16%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#2654)	13	3	23.08%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[jasisk]

@jdx I'd added the tiny bit of config ages ago for corepack specifically in the node plugin (MISE_NODE_COREPACK)—would you like me to remove that bit of functionality now that this much more generally-useful hook is in place?

[jdx]

nah I think that can stay for now