relaxed regexp to parse version out of a tag

[hellt]

to allow parsing custom image tags such as:

version_22.6.4-30192

[codecov[bot]]

Codecov Report

Merging #24 (beaf7b0) into main (88b58e7) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #24   +/-   ##
=======================================
  Coverage   19.71%   19.71%           
=======================================
  Files          10       10           
  Lines         771      771           
=======================================
  Hits          152      152           
  Misses        615      615           
  Partials        4        4           

Impacted Files	Coverage Δ
api/types/v1alpha1/srl_version.go	100.00% <100.00%> (ø)

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