Fix issues with RepoInit on AEM instances without /etc/designs

[bstopp]

Description

Use environment specific runmode for repo init configs; also enforce /etc/designs node creation.

Related Issue

Issue #73

How Has This Been Tested?

Manually tested on latest SDK

Screenshots (if appropriate):

Types of changes

• [X] 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:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #74 (3061098) into main (cef439b) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #74   +/-   ##
=========================================
  Coverage     82.47%   82.47%           
  Complexity      452      452           
=========================================
  Files            34       34           
  Lines          1923     1923           
  Branches        354      354           
=========================================
  Hits           1586     1586           
  Misses          231      231           
  Partials        106      106           

Flag	Coverage Δ
unittests	82.47% <ø> (ø)

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