fix(virtual-machine): Validate minimum memory for mariadb (backport #3238)

[mergify]

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This is an automatic backport of pull request #3238 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.12%. Comparing base (7f59565) to head (bce52ca).

Files with missing lines	Patch %	Lines
...s/press/doctype/virtual_machine/virtual_machine.py	0.00%	3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3239      +/-   ##
==========================================
- Coverage   45.12%   45.12%   -0.01%     
==========================================
  Files         693      693              
  Lines       47226    47229       +3     
==========================================
  Hits        21311    21311              
- Misses      25915    25918       +3     

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