Initial version of job

.github/kotlin-warning-matcher.json

@@ -0,0 +1,19 @@
+{
+  // Example:
+  // w: /path/to/file/KotlinFile.kt: (14, 5): Parameter 'foo' is never used
+  "problemMatcher": [
+    {
+      "owner": "kotlin-warning",
+      "pattern": [
+        {
+          "regexp": "^w:\\s+(\\S+):\\s+\\((\\d+),\\s+(\\d+)\\):\\s+(.+)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4
+        }
+      ],
+      "severity": "warning"
+    }
+  ]
+}