fix(plugins/container): use C.GoString() in AskForContainerInfo.

Since the c string comes from a stack variable `.c_str()`,
and the go string will be used async, `ptr.GoString()` does not
guarantee that the string is kept alive for all its duration,
leading to bogus reads.

Signed-off-by: Federico Di Pierro <nierro92@gmail.com>

Author: FedeDP

plugins/container/go-worker/worker_api.go

@@ -113,7 +113,7 @@ func StopWorker(pCtx unsafe.Pointer) {
 
 //export AskForContainerInfo
 func AskForContainerInfo(containerId *C.cchar_t) {
-	containerID := ptr.GoString(unsafe.Pointer(containerId))
+	containerID := C.GoString(containerId)
 	ch := container.GetFetcherChan()
 	if ch != nil {
 		ch <- containerID