Actions upgrade

[atymic]

• release workflow
• tag workflow
• new repo workflow

[Copilot]

Pull request overview

This PR modernizes the repo-splitting and release automation around GitHub Actions by replacing the previous monorepo-builder-based split approach with splitsh-lite and adding scripts/workflows to create split repos and publish releases based on PR labels.

Changes:

• Replace monorepo-builder splitting with a splitsh-lite driven tools/split.sh and a new split-overrides.json mapping.
• Add automation scripts/workflows to create missing split repos and to release changed providers after a split run.
• Update existing tooling/workflows (tokens, action versions, paths) and remove obsolete scripts/config.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tools/update-repo-descriptions.php	Refactors GitHub API calls to use withToken() and flatMap() while updating repo metadata/topics.
tools/split.sh	New splitsh-lite based parallel splitter that force-pushes split SHAs to provider repos.
tools/release.php	New script to detect changed providers + bump type and create GitHub releases in split repos.
tools/release-major-version.php	Removed legacy “release major version across all providers” script.
tools/doc-upgrade.php	Fixes provider directory discovery to be relative to __DIR__.
tools/create-repos.php	New script to create missing split repos for newly added providers and apply standard settings/topics.
tools/create-repo.php	Removed legacy single-repo creation script.
tools/close-subtree-prs.php	Refactors subtree PR closer to use token + baseUrl and simplifies API calls.
split-overrides.json	New mapping of provider directory names to non-1:1 GitHub repo names.
monorepo-builder.yml	Removed monorepo-builder split configuration.
composer.json	Updates PHP/dev dependencies to support new tooling (notably composer/semver) and removes monorepo-builder.
.github/workflows/test.yml	Simplifies CI to a single lint job/version and removes caching/matrix.
.github/workflows/subtree-pr-close.yml	Updates actions/checkout and PHP version for the subtree PR close workflow.
.github/workflows/release.yml	New workflow to release providers after a successful split workflow run.
.github/workflows/monorepo-split.yml	Reworks split workflow to install splitsh-lite, run repo creation, and execute tools/split.sh.
.github/workflows/coding-standards.yml	Bumps default PHP input version.
.gitattributes	Stops exporting the removed monorepo-builder config.

Comments suppressed due to low confidence (1)

tools/update-repo-descriptions.php:35

• The repo homepage is being set from $repo['name'], but several split repos have names that include uppercase letters or punctuation (e.g. App.net, Microsoft-Azure). The docs URLs in src/*/composer.json use lowercased, punctuation-stripped slugs (e.g. appnet, microsoft-azure), so this will point many repos at a non-existent page. Suggest deriving a docs slug (e.g. lowercase + strip characters like .) or using a mapping so the generated homepage matches the actual site path.

                'description' => sprintf('[READ ONLY] Subtree split of the SocialiteProviders/%s Provider (see SocialiteProviders/Providers)', $repo['name']),
                'homepage'    => sprintf('https://socialiteproviders.com/%s/', $repo['name']),
                'has_issues'  => false,

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