Add Accept EULA into tdnf update (#279)

Author: darrentu

linux/tools.Dockerfile

@@ -11,7 +11,7 @@ FROM ${IMAGE_LOCATION}
 
 RUN tdnf clean all
 RUN tdnf repolist --refresh
-RUN tdnf update -y
+RUN ACCEPT_EULA=Y tdnf update -y
 
 # Install latest Azure CLI package. CLI team drops latest (pre-release) package here prior to public release
 # We don't support using this location elsewhere - it may be removed or updated without notice
@@ -75,4 +75,4 @@ RUN ln -s /usr/bin/node /usr/bin/nodejs
 ENV PATH ~/.local/bin:~/bin:~/.dotnet/tools:$PATH
 
 # Set AZUREPS_HOST_ENVIRONMENT 
-ENV AZUREPS_HOST_ENVIRONMENT cloud-shell/1.0
+ENV AZUREPS_HOST_ENVIRONMENT cloud-shell/1.0