👷 Replace Repology with Alpine CDN datasource for package pins

[frenck]

Proposed Changes

(Describe the changes and rationale behind them)

Renovate's repology datasource has stopped resolving Alpine package pins across the organization: every alpine_3_24/* lookup returns no-result, so Alpine pins are no longer updated at all and builds break whenever upstream moves a pinned package. Repology rate limits its tools/project-by endpoint hard, and each run resolves 27 packages through it here.

This applies the same fix that landed on hassio-addons/app-ssh#1119: a Renovate custom datasource that reads Alpine's own package index on dl-cdn.alpinelinux.org, which is the same place apk installs from. Renovate's html format turns each href in the directory listing into a version candidate, and extractVersionTemplate picks the version per package (the \d keeps nano from matching nano-syntax-... style siblings).

• Dependency names stay alpine_3_24/<package>, so PR titles, branch names and the automerge rule are unchanged.
• Custom datasources use registryStrategy: "first", so packages from the community repository need a rule pointing at the community index. Derived mechanically from the v3.24 APKINDEX files against this Dockerfile, exactly one pinned package lives there: libnsl-dev. All other 26 pins are in main, and none are missing from both indexes.

Verified by running Renovate against this repository, docker run ghcr.io/renovatebot/renovate:latest with RENOVATE_PLATFORM=local RENOVATE_DRY_RUN=lookup (v44.82.4):

• renovate-config-validator validates the config cleanly
• all 27 Alpine pins are extracted and resolve with a currentVersion from the CDN, 26 via the main index and 1 (libnsl-dev) via community, zero Found no results in the debug log
• zero Alpine updates are found, which matches an independent diff of every pin against the v3.24 APKINDEX files: all 27 pins are current

So no stale pin is blocking anything in this repository right now; this PR only restores Renovate's ability to notice the next one.

Stacked on #380, which migrates fileMatch to managerFilePatterns in the same file. The diff here is the datasource change only.

Related Issues

(Github link to related issues or pull requests)

Same change as hassio-addons/app-ssh#1119. Dependency Dashboard: #126.

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