ssl for postgis connection

Description

Added environment variable for ssl in postgres connection in knex

[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

[ ] I have read the CONTRIBUTING document.
[ ] I have checked to ensure that there aren't other open Pull Requests for the same update/change.
[ ] My code follows the code style of this project.
[ ] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[ ] I have added tests to cover my changes.
[ ] All new and existing tests passed.