ci: add custom renovate rule to bump agent versions (#100)

Author: ocofaigh

renovate.json

@@ -1,4 +1,38 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": ["github>terraform-ibm-modules/common-dev-assets:commonRenovateConfig"]
+  "extends": ["github>terraform-ibm-modules/common-dev-assets:commonRenovateConfig"],
+  "regexManagers": [
+    {
+      "fileMatch": ["^chart/logdna-agent/values.yaml$"],
+      "matchStrings": [
+        "datasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?\\s.*?tag: \"(?<currentValue>.*)\"\\s"
+      ],
+      "versioningTemplate": "{{#if versioning}}{{{versioning}}}{{else}}semver{{/if}}"
+    },
+    {
+      "fileMatch": ["^variables.tf$"],
+      "matchStrings": [
+        "datasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?\\s.*? = \"(?<currentValue>.*)\"\\s"
+      ],
+      "versioningTemplate": "{{#if versioning}}{{{versioning}}}{{else}}semver{{/if}}"
+    }
+  ],
+  "packageRules": [
+    {
+      "matchManagers": ["regex"],
+      "matchUpdateTypes": ["patch"],
+      "semanticCommitType": "fix"
+    },
+    {
+      "matchManagers": ["regex"],
+      "matchUpdateTypes": ["minor"],
+      "semanticCommitType": "feat"
+    },
+    {
+      "matchManagers": ["regex"],
+      "matchUpdateTypes": ["major"],
+      "semanticCommitType": "feat",
+      "prFooter" : "BREAKING CHANGE: dependency major version update"
+    }
+  ]
 }