[release-17.0] Update env.sh so that is does not error when running on Mac (#15835) (#15913)

Signed-off-by: bddicken <bddicken@gmail.com>
Co-authored-by: vitess-bot[bot] <108069721+vitess-bot[bot]@users.noreply.github.com>

Author: vitess-bot[bot]

examples/common/env.sh

@@ -90,6 +90,8 @@ alias mysql="command mysql --no-defaults -h 127.0.0.1 -P 15306"
 alias vtctlclient="command vtctlclient --server localhost:15999 --log_dir ${VTDATAROOT}/tmp --alsologtostderr --config-file-not-found-handling=ignore"
 alias vtctldclient="command vtctldclient --server localhost:15999"
 
-# Make sure aliases are expanded in non-interactive shell
-shopt -s expand_aliases
+# If using bash, make sure aliases are expanded in non-interactive shell
+if [[ -n ${BASH} ]]; then
+    shopt -s expand_aliases
+fi