container: clean up after unpacking oci archive

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/rootfs/usr/sbin/container

@@ -58,6 +58,7 @@ unpack_archive()
 
 	[ -n "$quiet" ] || log "Extracting OCI archive $file ..."
         tar xf "$file" || (log "Error: failed unpacking $file in $(pwd)"; exit 1)
+	remove=true
     fi
 
     dir=$(dirname "$index")
@@ -72,6 +73,10 @@ unpack_archive()
 	name=$dir
     fi
 
+    if [ "$remove" = "true" ]; then
+	rm -rf "$file"
+    fi
+
     echo "$name"
 }