Add cron job for testing installation

[btjanaka]

Description

To increase confidence in our installation process, this PR adds a job that installs pyribs from PyPI on a daily basis. The time chosen is 19:00 UTC, which is 11AM PST or 12PM PDT (daylight savings time dictates which one applies).

This job can also be triggered by pushing to the schedule-install branch.

TODO

• [x] Test job

Questions

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [x] I have added a one-line description of my change to the changelog in HISTORY.md
• [x] This PR is ready to go