Add OpenCode config with golangci-lint LSP

.opencode/opencode.jsonc

@@ -0,0 +1,23 @@
+{
+  "lsp": {
+    "golangci-lint": {
+      "command": [
+        "golangci-lint-langserver"
+      ],
+      "extensions": [
+        ".go"
+      ],
+      "initialization": {
+        "command": [
+          "golangci-lint",
+          "run",
+          "--output.json.path",
+          "stdout",
+          "--show-stats=false",
+          "--issues-exit-code=1"
+        ]
+      }
+    }
+  },
+  "$schema": "https://opencode.ai/config.json"
+}