fix(renovate): drop a custom manager that matches nothing

renovate-config.json

@@ -84,15 +84,6 @@
   ],
 
   "customManagers": [
-    {
-      "customType": "regex",
-      "description": "EduIDE-deployment pins the student IDE images as plain YAML list items under preloading.images. The helm-values manager only understands image dicts and scalars, so without this they would never be updated.",
-      "managerFilePatterns": ["/^deployments/.+/values\\.ya?ml$/"],
-      "matchStrings": [
-        "-\\s+(?<depName>ghcr\\.io/[^\\s:\"']+):(?<currentValue>[^\\s\"']+)"
-      ],
-      "datasourceTemplate": "docker"
-    },
     {
       "customType": "regex",
       "description": "theiaPlugins in EduIDE/package.json pins plugin tarballs by GitHub release URL. No built-in manager reads custom manifest keys.",
@@ -199,21 +190,13 @@
       "addLabels": ["helm"]
     },
     {
-      "description": "Image tags in values.yaml decide what actually runs - keep them apart from chart dependency bumps so one can be reverted without the other. Matched by path as well as manager, because the preloading.images list is picked up by a custom regex manager and must land in the same group.",
+      "description": "Image tags in values.yaml decide what actually runs - keep them apart from chart dependency bumps so one can be reverted without the other.",
       "matchManagers": ["helm-values"],
       "matchUpdateTypes": ["minor", "patch", "digest", "pin"],
       "groupName": "deployed image tags",
       "groupSlug": "helm-values",
       "addLabels": ["helm", "deployment"]
     },
-    {
-      "description": "The preloading.images list entries, same group as the rest of the deployed image tags.",
-      "matchFileNames": ["deployments/**"],
-      "matchUpdateTypes": ["minor", "patch", "digest", "pin"],
-      "groupName": "deployed image tags",
-      "groupSlug": "helm-values",
-      "addLabels": ["helm", "deployment"]
-    },
     {
       "description": "Tool versions pinned via '# renovate:' comments in workflows and Dockerfiles ride along with their ecosystem group.",
       "matchManagers": ["custom.regex"],

renovate/README.md

@@ -93,15 +93,21 @@ in the npx cache, which may be years old and will reject options that are perfec
 
 ## Custom managers
 
-Two things in this org are invisible to Renovate's built-in managers:
-
-- **`EduIDE-deployment/deployments/*/values.yaml`** pins the student IDE images as a plain
-  YAML list under `preloading.images:`. The `helm-values` manager only understands
-  `image: {repository, tag}` dicts and `image: repo:tag` scalars, so a regex manager covers
-  the list form. These are the images students actually run, so this is the highest-value
-  update surface in the org.
-- **`EduIDE/package.json` `theiaPlugins`** pins plugin tarballs by URL. No manager reads
-  custom manifest keys.
+Some things in this org are invisible to Renovate's built-in managers and need a regex
+manager. One lives here, one lives in a repo:
+
+- **`EduIDE/package.json` `theiaPlugins`** pins plugin tarballs by GitHub release URL. No
+  built-in manager reads custom manifest keys. Covered by the preset.
+- **`EduIDE-deployment/environments/*/env.yaml`** carries `spec.platform.chartVersion`.
+  These are `eduide.dev/v1 Environment` manifests, so neither `helmv3` nor `helm-values`
+  can read them. Covered by that repo's own `renovate.json`, since the file shape is
+  specific to it.
+
+**Before adding a manager here, check the path still exists.** The preset briefly shipped a
+manager for `deployments/*/values.yaml` in EduIDE-deployment, matching a `preloading.images`
+list. That layout had been replaced by `environments/` a day earlier, so the manager matched
+nothing. A regex that matches nothing looks exactly like a regex that found nothing to
+update - the only way to tell them apart is a dry run.
 
 ### Known gap: open-vsx