Update Dockerfile

containers/sshclient/Dockerfile

@@ -1,7 +1,7 @@
 FROM debian:bullseye-slim
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends \
     bash \
     screen \
     curl \