Explicitly enable managers we want instead of disabling ones renovate…

… auto-detected

renovate.json

@@ -2,7 +2,9 @@
   "extends": [
     "config:best-practices",
     ":rebaseStalePrs",
-    "customManagers:dockerfileVersions"
+  ],
+  "enabledManagers": [
+    "custom.regex"
   ],
   "packageRules": [
     {
@@ -21,17 +23,6 @@
       "extractVersion": "^releases/solr/(?<version>\\d+\\.\\d+\\.\\d+)$",
       "versioning": "semver"
     },
-    {
-      "matchManagers": [
-        "github-actions",
-        "dockerfile",
-        "docker-compose",
-        "gradle",
-        "gradle-wrapper",
-        "composer"
-      ],
-      "enabled": false
-    },
     {
       "matchUpdateTypes": [
         "major"