Variable substitution

[jkroepke]

Fixes: #192

[codecov]

Codecov Report

Merging #198 into master will decrease coverage by 0.11%.
The diff coverage is 95.23%.

@@             Coverage Diff              @@
##             master     #198      +/-   ##
============================================
- Coverage     97.32%   97.21%   -0.12%     
- Complexity      990      993       +3     
============================================
  Files            62       62              
  Lines          3143     3159      +16     
  Branches        294      296       +2     
============================================
+ Hits           3059     3071      +12     
- Misses           38       42       +4     
  Partials         46       46              

Impacted Files	Coverage Δ	Complexity Δ
...ycloak/config/provider/KeycloakImportProvider.java	88.70% <94.11%> (-1.09%)	17.00 <0.00> (+4.00)	⬇️
...loak/config/properties/ImportConfigProperties.java	100.00% <100.00%> (ø)	9.00 <2.00> (+1.00)
...cloak/config/exception/InvalidImportException.java	50.00% <0.00%> (-50.00%)	1.00% <0.00%> (-1.00%)

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