Mimemagic docker installation fix

[Huahan98]

Resolves the breaking installation of mimemagic, related to rails/rails#41750

Description

Motivated by rails/rails#41757, using shared-mime-infoto make installing mimemagic compliant to MIT license again.

Motivation and Context

How Has This Been Tested?

docker-compose build now builds successfully (tested locally)

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 change requires a change to the documentation, which is located at Autolab Docs
• I have updated the documentation accordingly, included in this PR

Other issues / help required

If unsure, feel free to submit first and we'll help you along.

[fanpu]

Builds successfully with docker-compose build --no-cache, and bundle install on Autolab repo also works

[fanpu]

Just FYI: my bundler changed this to

@@ -162,7 +162,7 @@ GEM
     mime-types-data (3.2019.1009)
     mimemagic (0.4.2)
       nokogiri (~> 1)
-      rake (>= 0)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
     mini_racer (0.2.9)

since >= 0 is vacuous. Doesn't affect functionality, but might be more semantic. Does yours explicitly give >= 0?

[Huahan98]

Nope I agree >=0 is not needed. Removed in a new commit