feat: unpin

Author: zaaarf

proto/auth.proto

@@ -8,7 +8,6 @@ import "common.proto";
 service Auth {
 	// Send credentials, returns valid session token.
 	rpc Login (LoginRequest) returns (LoginResponse);
-
 	// If the given token has recently expired, get a new valid one.
 	rpc Refresh (common.Token) returns (common.Token);
 }

proto/workspace.proto

@@ -14,7 +14,9 @@ service Workspace {
 	// Handle a buffer access request and return a buffer token for it.
 	rpc GetBufferToken (files.BufferRequest) returns (common.Token);
 	// Transforms an ephemeral buffer in a persistent one.
-	rpc PinBuffer (files.BufferRequest) returns (common.Empty);
+	rpc PinBuffer (files.BufferRequest) returns (common.Token);
+	// Transforms a persistent buffer in an ephemeral one.
+	rpc UnPinBuffer (files.BufferRequest) returns (common.Token);
 	// Delete a buffer.
 	rpc DeleteBuffer (files.BufferRequest) returns (common.Empty);
 	// Retrieves the buffers in the workspace that are children of the given path.