Fix signed foreign keys

[zachee54]

PR Description

Migration command fails due to malformed foreign keys.
It appears that the foreign keys were recently defined as unsigned, while the referenced primary keys are signed by default.

Checklist

• I agree with the Code Contribution License Agreement in CONTRIBUTING.md

[codecov]

Codecov Report

Merging #38 (37fb06d) into master (ac3da02) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #38   +/-   ##
=========================================
  Coverage     83.49%   83.49%           
  Complexity      865      865           
=========================================
  Files            56       56           
  Lines          3218     3218           
=========================================
  Hits           2687     2687           
  Misses          531      531           

[zachee54]

May it depend on the database engine ?

[dereuromark]

Most likely on the strictness (version) of the DB, yeah

[zachee54]

In this case, may it be convenient not to specify any 'signed' clause in order to rely on DB default ?

[dereuromark]

With Cake5 actually this works: dereuromark@8ae0683
This is probably due to phinx 0.15 and the defaults on signed and primary keys etc.

Maybe this would also be useful then already within Cake4?