Added ssh secret to compathelper yml file

[amartinhuertas]

Tries to solve issue #527

[amartinhuertas]

@fverdugo ... is there any way to manually trigger CompatHelper from this branch so that we can double check that this PR solves the issue? I did not come up with a solution after quick searching, perhaps we can just accept the PR and then keep in mind that we have to check this in the next CompatHelper action.

[codecov-io]

Codecov Report

Merging #528 (4fd7f44) into master (ed3334e) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #528      +/-   ##
==========================================
+ Coverage   86.14%   86.16%   +0.01%     
==========================================
  Files         145      145              
  Lines       11327    11327              
==========================================
+ Hits         9758     9760       +2     
+ Misses       1569     1567       -2     

Impacted Files	Coverage Δ
src/FESpaces/FESpacesWithConstantFixed.jl	74.32% <0.00%> (+2.70%)	⬆️

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[fverdugo]

we can just accept the PR and then keep in mind that we have to check this in the next CompatHelper action.

Let's do this!