Fix CI and foundry binary lookup for new installation directory

[antico5]

2 weeks ago, the Foundry team updated the install scripts to use XDG_CONFIG_HOME if available, instead of HOME. Our CI box has it defined so tests were not passing, and I also updated the lookup function for forge binary in our server.

[codecov-commenter]

Codecov Report

Merging #490 (4074043) into development (9cfb24b) will decrease coverage by 0.23%. The diff coverage is n/a.

:exclamation: Current head 4074043 differs from pull request most recent head 7a0df87. Consider uploading reports for the commit 7a0df87 to get more accurate results

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@@               Coverage Diff               @@
##           development     #490      +/-   ##
===============================================
- Coverage        53.52%   53.29%   -0.23%     
===============================================
  Files              187      187              
  Lines             4813     4813              
  Branches           791      791              
===============================================
- Hits              2576     2565      -11     
- Misses            2003     2010       +7     
- Partials           234      238       +4     

see 4 files with indirect coverage changes