Add fetching of env variables

Author: denis256

unidev-common/src/main/java/com/unidev/platform/Env.java

@@ -0,0 +1,18 @@
+package com.unidev.platform;
+
+public class Env {
+
+    public String env(String name, String defaultValue) {
+        return System.getenv().getOrDefault(name, defaultValue);
+    }
+
+    public String env(String name) {
+        String value = System.getenv(name);
+
+        if (value == null) {
+            throw new RuntimeException("No Env variable " + name);
+        }
+
+        return value;
+    }
+}