manage dockcross via renovate

Author: pschichtel

renovate.json5

@@ -1,3 +1,15 @@
 {
-    "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    "customManagers": [
+        {
+            "fileMatch": ["^conventions/src/main/kotlin/tel\\.schich\\.javacan\\.convention\\.native\\.gradle\\.kts$"],
+            "matchStrings": [
+                "dockcrossVersion\\s*=\\s*\"(?<currentValue>[^\"]+)\""
+            ],
+            // this is hardcoded to linux-x64, but the tag would normally be aligned anyway
+            "depNameTemplate": "docker.io/dockcross/linux-x64",
+            "datasourceTemplate": "docker",
+            "versioningTemplate": "loose",
+        }
+    ],
 }