diff --git a/main.js b/main.js
index 148781a..67de4b0 100644
--- a/main.js
+++ b/main.js
@@ -183,6 +183,14 @@ async function main() {
         ])
         core.endGroup()
 
+        core.startGroup("Check sourceDirectory")
+        await exec.exec("docker", [
+            "exec",
+            container,
+            "ls", "-la", sourceDirectory
+        ])
+        core.endGroup()
+
         if (imageTag != "trusty") {
             core.startGroup("Install build dependencies")
             await exec.exec("docker", [