allow manual tags

[emmaai]

As the title.

The workflow fails accidentally and the cached wheel will be gone. In this case, the release will be triggered by manually tagging.

Add back persist, as it's proved irrelevant to issue #100

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (71574e8) 76.41% compared to head (1a707fe) 76.38%.
Report is 2 commits behind head on develop.

Files	Patch %	Lines
odc/stats/proc.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #111      +/-   ##
===========================================
- Coverage    76.41%   76.38%   -0.03%     
===========================================
  Files           34       34              
  Lines         3209     3210       +1     
===========================================
  Hits          2452     2452              
- Misses         757      758       +1     

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