Install the SASL library to build the VNC SASL auth protocol code.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 tests/docker/dockerfiles/debian-amd64.docker | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/docker/dockerfiles/debian-amd64.docker b/tests/docker/dockerfiles/debian-amd64.docker
index 3b860af106..0456fc7a0c 100644
--- a/tests/docker/dockerfiles/debian-amd64.docker
+++ b/tests/docker/dockerfiles/debian-amd64.docker
@@ -17,6 +17,7 @@ RUN apt update && \
         libbz2-dev \
         liblzo2-dev \
         librdmacm-dev \
+        libsasl2-dev \
         libsnappy-dev \
         libvte-dev
 
-- 
2.21.1