Adds a line that exports environment variables to the bashrc

[joshua-liberman]

Description

This fix links the Panoptes env file to the bashrc from within the install-pocs script.

Fixes #973

Related Issue

Previously, the environment variables weren't getting set after a restart, and the bashrc file had to be manually edited to link the environment variables.

How Has This Been Tested?

This fix has not been tested on a clean install but was tested on an existing Ubuntu 20.03 Panoptes development system. The env file was removed beforehand as well as any references to Panoptes environment variables in the bashrc.

Screenshots (if appropriate):

Types of changes

• 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 change)

Checklist:

• 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 read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #975 into develop will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #975      +/-   ##
===========================================
+ Coverage    68.40%   68.42%   +0.02%     
===========================================
  Files           95       95              
  Lines         9500     9500              
  Branches       873      873              
===========================================
+ Hits          6498     6500       +2     
+ Misses        2838     2836       -2     
  Partials       164      164              

Impacted Files	Coverage Δ
src/panoptes/pocs/dome/astrohaven.py	79.27% <0.00%> (+1.80%)	⬆️

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[wtgee]

Awesome, thanks for getting this in! Can you add the suggestion then I'll merge.