The FileMode argument is explicitly set to an insecure value

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Running yggdrasil-worker-package-manager through a static analyzer resulting in some findings that could be fixed.

1. rhc/yggdrasil-worker-package-manager/util.go:50: insecure_file_permissions: The "FileMode" argument is explicitly set to an insecure value making the file world-readable, world-writeable or world-executeable.
2. rhc/yggdrasil-worker-package-manager/util.go:50: remediation: Set the "FileMode" argument to a value that forbids the world permission.
#    48|   		return ioutil.WriteFile(name, data, 0644)
#    49|   	} else {
#    50|-> 		file, err := os.OpenFile(name, os.O_WRONLY|os.O_APPEND, 0644)
#    51|   		if err != nil {
#    52|   			return fmt.Errorf("cannot open file for appending: %w", err)

1. rhc/yggdrasil-worker-package-manager/package_manager_apt.go:31: insecure_file_permissions: The "FileMode" argument is explicitly set to an insecure value making the file world-readable, world-writeable or world-executeable.
2. rhc/yggdrasil-worker-package-manager/package_manager_apt.go:31: remediation: Set the "FileMode" argument to a value that forbids the world permission.
#    29|   
#    30|   func (p *PackageManagerApt) EnableRepo(sourceLine string) (stdout, stderr []byte, code int, err error) {
#    31|-> 	if err := os.MkdirAll(filepath.Base(sourcesFile), 0755); err != nil {
#    32|   		return nil, nil, -1, fmt.Errorf("cannot create sources list directory: %w", err)
#    33|   	}