🔧 chore: add Docker support to Renovate configuration

Enable dockerfile and docker-compose managers in Renovate and add package rules to group minor and patch updates for Docker-related dependencies, consistent with existing cargo configuration.

.github/renovate.json5

@@ -1,7 +1,7 @@
 {
   $schema: "https://docs.renovatebot.com/renovate-schema.json",
   extends: ["github>bitwarden/renovate-config"], // Extends our default configuration for pinned dependencies
-  enabledManagers: ["cargo", "github-actions", "npm"],
+  enabledManagers: ["cargo", "dockerfile", "docker-compose", "github-actions", "npm"],
   packageRules: [
     {
       // Group all Github Action minor updates together to reduce PR noise.
@@ -10,6 +10,16 @@
       matchUpdateTypes: ["minor"],
       addLabels: ["hold"],
     },
+    {
+      groupName: "dockerfile minor",
+      matchManagers: ["dockerfile"],
+      matchUpdateTypes: ["minor", "patch"],
+    },
+    {
+      groupName: "docker-compose minor",
+      matchManagers: ["docker-compose"],
+      matchUpdateTypes: ["minor", "patch"],
+    },
     {
       // Enable support for Rust toolchain updates.
       matchManagers: ["custom.regex"],