Do not have bootstrap run sudo commands.

[dracos]

Your site user may not have access to sudo, and your admin user may cause permission issues if used to do the git checkout, or the Perl module installation. Document the separate script to install system packages instead.

Fixes #2930. I think it causes too much confusion to have it run sudo-level commands, when it's a user-level script. I realise this was introduced because a new Perl module needed a new library package, I've added some documentation about updating.

I've left in the Docker fms user being able to run bin/install_packages, don't see why not, and have changed the preinit to run this as well. I'm not sure if that's everything.

[codecov]

Codecov Report

Merging #3113 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3113   +/-   ##
=======================================
  Coverage   83.42%   83.42%           
=======================================
  Files         248      248           
  Lines       15574    15574           
  Branches     2906     2906           
=======================================
  Hits        12992    12992           
  Misses       1660     1660           
  Partials      922      922           

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[sagepe]

Looks fine, but I think it may be worth adding a call to install_packages in the Vagrantfile where the mySociety box is used - this way we'll ensure that new packages are installed before Perl modules are updated, ensuring any new build dependencies are met. I'll add a commit - see what you think.

[dracos]

Sounds good. Have squashed together; do you want to do a check of all this and then we can do a 3.0.2 release perhaps?

[sagepe]