Merge branch 'master' into 3.0

# Conflicts:
#	.github/workflows/testing.yml
#	Dockerfile
#	gns3server/version.py

gns3server/compute/base_node.py

@@ -974,7 +974,7 @@ class BaseNode:
         """
 
         available_ram = int(psutil.virtual_memory().available / (1024 * 1024))
-        percentage_left = psutil.virtual_memory().percent
+        percentage_left = 100 - psutil.virtual_memory().percent
         if requested_ram > available_ram:
             message = '"{}" requires {}MB of RAM to run but there is only {}MB - {}% of RAM left on "{}"'.format(
                 self.name, requested_ram, available_ram, percentage_left, platform.node()