fix: renovate k3s builds numbers

Signed-off-by: Devin Buhl <devin@buhl.casa>

.github/renovate.json5

@@ -12,6 +12,7 @@
     "github>onedr0p/flux-cluster-template//.github/renovate/commitMessage.json5",
     "github>onedr0p/flux-cluster-template//.github/renovate/groups.json5",
     "github>onedr0p/flux-cluster-template//.github/renovate/labels.json5",
+    "github>onedr0p/flux-cluster-template//.github/renovate/packageRules.json5",
     "github>onedr0p/flux-cluster-template//.github/renovate/semanticCommits.json5",
     "helpers:pinGitHubActionDigests"
   ],

.github/renovate/packageRules.json5

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "packageRules": [
+    {
+      "description": "Use custom versioning for k3s",
+      "matchDatasources": ["github-releases"],
+      "versioning": "regex:^v(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+)(?<compatibility>\\+k3s)(?<build>\\d+)$",
+      "matchPackagePatterns": ["k3s"]
+    }
+  ]
+}