Create directory automatically

[jnovick]

• When writing to a new file, create the directory for the file if it does not already exist
• This is useful if writing helmvalues to a new directory that is solely used for updating the image version. The ArgoCD Application can add a second source and reference the file with the ignoreMissingValueFiles flag turned on as an additional values file
• If the directory already exists, this command does nothing.

This will be most beneficial once https://github.com/argoproj-labs/argocd-image-updater/pull/663 is also merged.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.15%. Comparing base (c9ed948) to head (f91491a).

Files	Patch %	Lines
pkg/argocd/git.go	50.00%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #680      +/-   ##
==========================================
- Coverage   56.16%   56.15%   -0.01%     
==========================================
  Files          31       31              
  Lines        3105     3109       +4     
==========================================
+ Hits         1744     1746       +2     
- Misses       1222     1223       +1     
- Partials      139      140       +1     

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[jnovick]

@jannfis Any hints on how to resolve the CI failures? They do not appear to be related to my actual PR. Thanks for any guidance that you can provide.