Add in custom manager & rule to manage dependencies in gemspecs

Author: thompson-tomo

.github/renovate.json5

@@ -45,7 +45,14 @@
     },
     {
       matchUpdateTypes: ["major"],
-      matchCategories: ["ruby", "docker"],
+      matchCategories: ["ruby", "docker", "custom"],
+      matchDepTypes: ["development_dependency"],
+      schedule: ["before 8am on Monday"],
+    },
+    {
+      matchUpdateTypes: ["major"],
+      matchCategories: ["ruby", "docker", "custom"],
+      matchDepTypes: ["!development_dependency"],
       dependencyDashboardApproval: true,
     },
     {
@@ -107,6 +114,20 @@
       extractVersionTemplate: "^{{depVersion}}-alpine(?<version>\\d+(?:\\.\\d+)?(?:\\.\\d+)?)$",
       depNameTemplate: "{{packageName}}-alpine",
     },
+    {
+      customType: "regex",
+      description: "Update dependencies in gemspecs",
+      managerFilePatterns: [
+        "**/*.gemspec",
+      ],
+      matchStrings: [
+        ".add_(?<depType>.*dependency)\\s'(?<packageName>.+?)',\\s'\\S+\\s(?<depVersion>[0-9.]+)'",
+      ],
+      datasourceTemplate: "rubygems",
+      versioningTemplate: "ruby",
+      currentValueTemplate: "{{depVersion}}",
+      depTypeTemplate: "{{depType}}",
+    },
   ],
   lockFileMaintenance: {
     enabled: true,