Feature: Providing a way to clean up package installs

[jfmitchell]

When you use Adobe Cloud Manager to deploy new code to your environments on Adobe Managed Service instances, it will generate a unique version number for your package, based on the configuration in the pom.xml file.
The downside of this approach, is that over time, multiple versions of the packages are building up in the /etc/packages part of the repository. Eventually, this leads to the exhaustion of the storage

This is a configurable scheduled job that will only run on classic installations that can be used to clear down specific packages.

[codecov]

Codecov Report

Merging #2937 (88590a4) into master (96bbc28) will increase coverage by 0.06%.
The diff coverage is 73.63%.

@@             Coverage Diff              @@
##             master    #2937      +/-   ##
============================================
+ Coverage     54.51%   54.58%   +0.06%     
- Complexity     5684     5703      +19     
============================================
  Files           758      760       +2     
  Lines         30982    31092     +110     
  Branches       4005     4021      +16     
============================================
+ Hits          16890    16971      +81     
- Misses        12529    12548      +19     
- Partials       1563     1573      +10     

Impacted Files	Coverage Δ
...egarbagecollector/PackageGarbageCollectionJob.java	68.96% <68.96%> (ø)
...gecollector/PackageGarbageCollectionScheduler.java	91.30% <91.30%> (ø)

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[joerghoh]

LGTM