feat(builder): support adding custom middlewares

[pimlie]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

It seems that the middleware template in vue-app contains some business logic which should be moved to the builder class. This logic prevents me from adding a custom middleware (using the build:templates hook) in nuxt/press which has a webpack alias as path so it cant/shouldnt be resolved with relativeToBuild.

This pr moves that logic into the resolveMiddleware method of the builder class. Not sure if its needed, but to prevent a breaking change I have kept the resolve logic in the middleware template for now.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[galvez]

+1

[codecov-io]

Codecov Report

Merging #6342 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev    #6342      +/-   ##
=========================================
+ Coverage   95.7%   95.71%   +<.01%     
=========================================
  Files         79       79              
  Lines       2656     2661       +5     
  Branches     685      685              
=========================================
+ Hits        2542     2547       +5     
  Misses        98       98              
  Partials      16       16

Flag	Coverage Δ
#e2e	100% <ø> (ø)	⬆️
#fixtures	50.65% <100%> (+0.09%)	⬆️
#unit	92.37% <100%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
packages/builder/src/builder.js	99.62% <100%> (ø)	⬆️

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