Add option to set system properties from command-line

Author: charphi

CHANGELOG.md

@@ -11,6 +11,7 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 - ![SOURCE] Add source from Swiss Federal Statistical Office [#1132](https://github.com/nbbrd/sdmx-dl/issues/1132)
 - ![GRPC] Add simple web page to query rest web service
+- ![CLI] Add option to set system properties from command-line
 
 ### Fixed
 

sdmx-dl-cli/src/main/java/sdmxdl/cli/MainCommand.java

@@ -26,6 +26,7 @@
 import sdmxdl.About;
 import sdmxdl.cli.experimental.DebugCommand;
 
+import java.util.Map;
 import java.util.Properties;
 import java.util.concurrent.Callable;
 
@@ -63,7 +64,7 @@ public static void main(String[] args) {
 
         LoggerHelper.disableDefaultConsoleLogger();
         KeychainStoreIgnoredExceptionFix.register();
-        
+
         System.exit(execMain(specialProperties, System.getProperties(), args));
     }
 
@@ -79,6 +80,15 @@ private static int execMain(SpecialProperties specialProperties, Properties prop
         }
     }
 
+    @CommandLine.Option(
+            names = "-D",
+            mapFallbackValue = "", // allow -Dkey
+            hidden = true,
+            scope = CommandLine.ScopeType.INHERIT)
+    void setProperty(Map<String, String> props) {
+        props.forEach(System::setProperty);
+    }
+
     @CommandLine.Spec
     private CommandLine.Model.CommandSpec spec;