malliaridis commented on code in PR #4273:
URL: https://github.com/apache/solr/pull/4273#discussion_r3066046472


##########
.github/renovate.json:
##########
@@ -4,9 +4,19 @@
   "enabled": true,
   "gitIgnoredAuthors": ["renovate-bot <[email protected]>"],
   "dependencyDashboard": false,
-  "enabledManagers": ["gradle", "github-actions"],
+  "enabledManagers": ["gradle", "github-actions", "regex"],
   "labels": ["exempt-stale"],
-  "includePaths": ["gradle/libs.versions.toml", "versions.*", "build.gradle", 
".github/workflows/*"],
+  "includePaths": ["gradle/libs.versions.toml", "versions.*", "build.gradle", 
".github/workflows/*", "solr/docker/templates/Dockerfile.body.template"],
+  "customManagers": [
+    {
+      "description": "Track gosu GitHub releases and update ARG GOSU_VERSION 
in Dockerfile template",
+      "customType": "regex",
+      "fileMatch": ["^solr/docker/templates/Dockerfile\\.body\\.template$"],
+      "matchStrings": ["ARG GOSU_VERSION=(?<currentValue>[^\\s]+)"],
+      "depNameTemplate": "tianon/gosu",
+      "datasourceTemplate": "github-releases"

Review Comment:
   I could confirm your solution with the following command (renovate was 
installed via `npm install -g renovate`):
   
   ```bash
   LOG_LEVEL=debug RENOVATE_LOG_FORMAT=json npx renovate --platform local 
--dry-run=lookup 2>&1 > report.log
   ```
   
   I downgraded to 1.17 to see if renovate picks it up, and the output 
confirmed it:
   ```log
   
{"depName":"tianon/gosu","currentValue":"1.17","datasource":"github-releases","replaceString":"#
 renovate: datasource=github-releases depName=tianon/gosu\nARG 
GOSU_VERSION=1.17","updates":[{"bucket":"non-major","newVersion":"1.19","newValue":"1.19","releaseTimestamp":"2025-09-23T19:10:36.000Z","newVersionAgeInDays":198,"newMajor":1,"newMinor":19,"newPatch":0,"updateType":"minor","libYears":1.890115138254693,"branchName":"renovate/tianon-gosu-1.x"}],"packageName":"tianon/gosu","versioning":"semver-coerced","warnings":[],"sourceUrl":"https://github.com/tianon/gosu","registryUrl":"https://github.com","currentVersion":"1.17","currentVersionTimestamp":"2023-11-02T21:46:05.000Z","currentVersionAgeInDays":889,"isSingleVersion":true,"fixedVersion":"1.17"}
   ```
   
   The solution with the comment can still be used though, so that we can 
generalize the matching to other packages as well (more future-proof). This can 
be done by changing the matchStrings with
   ```json
   "matchStrings": [
     "# renovate: datasource=(?<datasource>[a-z-]+) 
depName=(?<depName>[^\\s]+)\\nARG \\w+_VERSION=(?<currentValue>[^\\s]+)"
   ],
   ```
   
   and add this comment above the `ARG`:
   ```
   # renovate: datasource=github-releases depName=tianon/gosu
   ARG GOSU_VERSION=1.19
   ```
   
   renovate will then pick the datasource and depName from the comment, rather 
than the renovate.json file (more flexible).



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