allow to take and check snapshot status when using pvc

Author: sagor999

components/ws-manager-api/core.proto

@@ -44,6 +44,9 @@ service WorkspaceManager {
     // deleteVolumeSnapshot asks ws-manager to delete specific volume snapshot and delete source from cloud provider as well
     rpc DeleteVolumeSnapshot(DeleteVolumeSnapshotRequest) returns (DeleteVolumeSnapshotResponse) {}
 
+    // checkVolumeSnapshotReady checks if a volume snapshot (PVC) is ready
+    rpc CheckVolumeSnapshotReady(CheckVolumeSnapshotReadyRequest) returns (CheckVolumeSnapshotReadyResponse) {}
+
     // UpdateSSHKey update ssh keys
     rpc UpdateSSHKey(UpdateSSHKeyRequest) returns (UpdateSSHKeyResponse) {}
 
@@ -239,6 +242,16 @@ message DeleteVolumeSnapshotResponse {
     bool was_deleted = 1;
 }
 
+message CheckVolumeSnapshotReadyRequest {
+    // ID is the name of volume snapshot
+    string id = 1;
+}
+
+message CheckVolumeSnapshotReadyResponse {
+    // ready will be true if snapshot is ready to be used
+    bool ready = 1;
+}
+
 enum AdmissionLevel {
     // WORKSPACE_ADMIT_OWNER_ONLY means the workspace can only be accessed using the owner token
     ADMIT_OWNER_ONLY = 0;