Getting pg_dump and pg_restore to work in BashOperator

I am using the image astronomerinc/ap-airflow:1.10.10-alpine3.10-onbuild in my local docker and cant seem to get pg_dump and pg_restore in the BashOperator. Here is the error I get for pg_dump:

pg_dump: command not found

same for pg_restore. Any help will be most appreciated