Fixed pulling images in docker compose

Author: ManickaP

eng/docker/libraries-sdk.linux.Dockerfile

@@ -1,6 +1,6 @@
 # Builds and copies library artifacts into target dotnet sdk image
 ARG BUILD_BASE_IMAGE=mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-f39df28-20191023143754
-ARG SDK_BASE_IMAGE=mcr.microsoft.com/dotnet/nightly/sdk:6.0-buster-slim
+ARG SDK_BASE_IMAGE=mcr.microsoft.com/dotnet/nightly/sdk:6.0-bullseye-slim
 
 FROM $BUILD_BASE_IMAGE as corefxbuild
 

src/libraries/System.Net.Security/tests/StressTests/SslStress/run-docker-compose.sh

@@ -89,6 +89,13 @@ fi
 
 compose_file="$scriptroot/docker-compose.yml"
 
+if ! docker-compose --file "$compose_file" pull client; then
+    exit $?
+fi
+if ! docker-compose --file "$compose_file" pull server; then
+    exit $?
+fi
+
 if ! docker-compose --file "$compose_file" build $build_args; then
     exit $?
 fi