Resolve "Check permissions for directoy and file creations from within our code"

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Related to #338

applications/venv-manager/venv-manager/venv-manager.go

@@ -166,7 +166,7 @@ func (v *VenvManager) getSDNConfigData() (*string, error) {
 
 // writeSDNConfigFile writes the SDN configuration in a string to a file.
 func (v *VenvManager) writeSDNConfigFile(sdnConfigToWrite string) error {
-	err := os.WriteFile(v.sdnConfigFilepath, []byte(sdnConfigToWrite), 0644)
+	err := os.WriteFile(v.sdnConfigFilepath, []byte(sdnConfigToWrite), 0600)
 	if err != nil {
 		return err
 	}
@@ -389,7 +389,7 @@ func (v *VenvManager) writeTopologyToYamlFile(containerlabStruct *containerlab.Y
 		return err
 	}
 
-	err = os.WriteFile(v.topologyFilepath, yaml, 0644)
+	err = os.WriteFile(v.topologyFilepath, yaml, 0600)
 	if err != nil {
 		return err
 	}