feat(base): export the package.json

[viceice]

Changes

@containerbase/base exports its package.json, so consumers like Renovate can read the package version and compare it with the version an image reports in /usr/local/containerbase/version. Without the entry in exports, Node refuses the @containerbase/base/package.json import. The README shows how to use it.

The version is written into package.json at release time, right before publishing, so the published file has the real version.

Context

• This closes an existing Issue, Closes: #
• This doesn't close an Issue, but I accept the risk that this PR may be closed if maintainers disagree with its opening or implementation

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Summary by CodeRabbit

• Documentation
  • Added guidance on importing and reading the package version.
• New Features
  • The package’s package.json is now available through the ./package.json export.

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