Method require_backend

crates/openshell-driver-vm/src/lifecycle.rs:238–242

(&mut self, backend: VmBackend)

impl LaunchPlan {
    pub fn require_backend(&mut self, backend: VmBackend) {
        if !self.required_backends.contains(&backend) {
            self.required_backends.push(backend);
        }
    }

    pub fn require_backend_feature(&mut self, feature: BackendFeature) {
        if !self.required_backend_features.contains(&feature) {