fix: Fix docker examples

- Moved `httpconnection` import from `clients` to `core`.
- Changed `tfgrid-sdk-ts` dashboard to playground.
- Added ipaddr to node_local().
- Added public keyword to OpenSSLGenerateArgs.
- Improved DockerEngine image and container loading.
- Added utils.contains_ssh_port.
- Improved error handling in DockerEngine.
- Improved Docker registry handling.

Co-authored-by: mariobassem12 <mariobassem12@gmail.com>
Co-authored-by: omda <mahmmoud.hassanein@gmail.com>

lib/builder/node_factory.v

@@ -4,7 +4,10 @@ import freeflowuniverse.herolib.data.ipaddress
 
 // get node connection to local machine
 pub fn (mut bldr BuilderFactory) node_local() !&Node {
-	return bldr.node_new(name: 'localhost')
+	return bldr.node_new(
+		name:   'localhost'
+		ipaddr: '127.0.0.1'
+	)
 }
 
 // format ipaddr: localhost:7777 .
@@ -64,7 +67,6 @@ pub fn (mut bldr BuilderFactory) node_new(args_ NodeArguments) !&Node {
 		mut iadd := ipaddress.new(args.ipaddr)!
 		node.name = iadd.toname()!
 	}
-
 	wasincache := node.load()!
 
 	if wasincache && args.reload {