Fix CRAN package version validation to allow more than 4 version components

[Copilot]

R packages like RcppEigen use versions with 5+ components (e.g., 0.3.4.0.2), which were rejected with "package version is invalid" due to an overly restrictive regex.

R's numeric_version spec imposes no upper bound on version components, so the {1,3} quantifier (limiting to 4 total components) was incorrect.

Changes

• modules/packages/cran/metadata.go: Relax version regex from {1,3} to +, accepting any number of dot/dash-separated integer components ≥ 2:

  - versionPattern = regexp.MustCompile(`\A[0-9]+(?:[.\-][0-9]+){1,3}\z`)
  + versionPattern = regexp.MustCompile(`\A[0-9]+(?:[.\-][0-9]+)+\z`)

• modules/packages/cran/metadata_test.go: Remove 1.2.3.4.5 / 1-2-3-4-5 from the invalid-version list; add ValidVersionManyComponents test covering 0.3.4.0.2, 1.2.3.4.5, and 1-2-3-4-5.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Problem upload R Packages into Gitea CRAN repo</issue_title>
<issue_description>### Description

When trying to upload a R package downloaded from the official CRAN repository :

https://cran.r-project.org/web/packages/RcppEigen/index.html

with the official curl method presented on the Gitea official website :

curl --user [user]:[password] --upload-file ./Packages/RcppEigen/RcppEigen_0.3.4.0.2.tar.gz [my_gitea_instance]/api/packages/[organization]/cran/src

it leads to the following error :

package version is invalid400

For many other packages, it works perfectly.

Gitea Version

1.22.4

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

package version is invalid400

Screenshots

No response

Git Version

No response

Operating System

Ubuntu 22.04.1 LTS

How are you running Gitea?

I have a managed Gitea instance deployed on a VM Ubuntu 22.04.1 LTS with snap method
I try to import the package from the same VM where my Gitea instance is deployed

Database

None</issue_description>

<agent_instructions>Open a PR by the suggested fix and add a test for this case.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Problem upload R Packages into Gitea CRAN repo #33152

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