Simplifies conditional logic in pgpassfile template
Simplifies conditional logic in pgpassfile template

There are two possible states for the postgres password:

  * role default of '', triggering dynamic password generation
  * custom string provided at the site-level

Once the var's value is determined, the config lines are indentical,
with only the var value changing. Therefore let's decide the var value
explicitly in its own block, then reuse the same config template lines
during interpolation of the value. More readable and explicit this way.

freedomofpress/FingerprintSecureDrop,freedomofpress/fingerprint-securedrop,freedomofpress/fingerprint-securedrop,freedomofpress/fingerprint-securedrop,freedomofpress/FingerprintSecureDrop