Port configuration to ccConfig scheme

Decentralize config validation
Modularize configuration handling

internal/config/validate.go

@@ -0,0 +1,28 @@
+// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved. This file is part of cc-backend.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+package config
+
+import (
+	"encoding/json"
+
+	cclog "github.com/ClusterCockpit/cc-lib/ccLogger"
+	"github.com/santhosh-tekuri/jsonschema/v5"
+)
+
+func Validate(schema string, instance json.RawMessage) {
+	sch, err := jsonschema.CompileString("schema.json", schema)
+	if err != nil {
+		cclog.Fatalf("%#v", err)
+	}
+
+	var v any
+	if err := json.Unmarshal([]byte(instance), &v); err != nil {
+		cclog.Fatal(err)
+	}
+
+	if err = sch.Validate(v); err != nil {
+		cclog.Fatalf("%#v", err)
+	}
+}