[Isolated Regions] Setting AWS CLI system-wide environment variables

within the 'patch-iso-instance' script: AWS_DEFAULT_REGION and AWS_CA_BUNDLE.

Signed-off-by: Giacomo Marciani <mgiacomo@amazon.com>

Author: gmarciani

cookbooks/aws-parallelcluster-install/templates/default/base/patch-iso-instance.sh.erb

@@ -58,4 +58,12 @@ done
 
 echo "[INFO] Complete: CA bundle configuration for AWS CLI in US isolated region"
 
+echo "[INFO] Starting: Setting system-wide environment variables for AWS CLI in US isolated region"
+
+echo "export AWS_DEFAULT_REGION=${REGION}" >> /etc/profile.d/aws-cli-default-config.sh
+
+echo "Defaults env_keep += \"AWS_DEFAULT_REGION AWS_CA_BUNDLE\"" > /etc/sudoers.d/pcluster-aws-cli-envkeep
+
+echo "[INFO] Complete: Setting system-wide environment variables for AWS CLI in US isolated region"
+
 echo "[INFO] Complete: instance configuration for US isolated region"