fix: expand home directory for docker secrets

[griseau]

Fixes: #8453
Related: Relevant tracking issues, for context
Merge before/after: Dependent or prerequisite PRs

Description

As mentioned in the issue, when using ~/ for secret path, this wasn't expended to home directory but was happened after current directory. This change expends the path to the realpath of home directory if starting with ~/

User facing changes (remove if N/A)

No user facing changes other than have it working as intended

Follow-up Work (remove if N/A)

Should we test the util function ? It's only calling Go standard package

And thanks @smaftoul for your help on this one ;)

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[codecov]

Codecov Report

Merging #8476 (937802c) into main (290280e) will decrease coverage by 5.27%.
The diff coverage is 55.02%.

@@            Coverage Diff             @@
##             main    #8476      +/-   ##
==========================================
- Coverage   70.48%   65.22%   -5.27%     
==========================================
  Files         515      602      +87     
  Lines       23150    29889    +6739     
==========================================
+ Hits        16317    19494    +3177     
- Misses       5776     8922    +3146     
- Partials     1057     1473     +416     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <ø> (ø)
... and 425 more

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[griseau]

@ericzzzzzzz I see the issue with the test failing but not sure to understand, any help for resolving this ?

[ericzzzzzzz]

@griseau This seems like a flaky test.. just re-ran to see if the test pass.