Allow force-overwrite for updates, too

Change-Id: I5f6f05e9c49eb10c9d9cb0532327538dab45b22f
diff --git a/cicd/pipelines/tasks/task_update_unstable.jenkins b/cicd/pipelines/tasks/task_update_unstable.jenkins
index 8cce983..e6c5134 100644
--- a/cicd/pipelines/tasks/task_update_unstable.jenkins
+++ b/cicd/pipelines/tasks/task_update_unstable.jenkins
@@ -53,8 +53,8 @@
 
                     sh """
                        aptly snapshot merge core-full-unstable-${stamp} ${debianMirrorSnapshotName} ${coreSnapshotName}
-                       aptly publish switch --batch --passphrase-file=/var/lib/aptly/keyring/passphrase.txt unstable filesystem:public:unstable core-full-unstable-${stamp}
-                       aptly publish switch --batch --passphrase-file=/var/lib/aptly/keyring/passphrase.txt unstable filesystem:public:unstable-bsp-enterprise ${bspSnapshotName}
+                       aptly publish switch --batch --force-overwrite --passphrase-file=/var/lib/aptly/keyring/passphrase.txt unstable filesystem:public:unstable core-full-unstable-${stamp}
+                       aptly publish switch --batch --force-overwrite --passphrase-file=/var/lib/aptly/keyring/passphrase.txt unstable filesystem:public:unstable-bsp-enterprise ${bspSnapshotName}
                        """
                 }
             }