ci: use tag latest for latest releases, nightly for nightly versions

[ajnavarro]

Added a new tag for them: nightly.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.27%. Comparing base (16ed32f) to head (bdd3b79).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2175      +/-   ##
==========================================
+ Coverage   49.06%   49.27%   +0.20%     
==========================================
  Files         576      576              
  Lines       77593    78004     +411     
==========================================
+ Hits        38069    38433     +364     
- Misses      36431    36440       +9     
- Partials     3093     3131      +38     

Flag	Coverage Δ
contribs/gnodev	24.18% <ø> (+0.03%)	⬆️
contribs/gnofaucet	15.31% <ø> (+0.85%)	⬆️
contribs/gnokeykc	0.00% <ø> (ø)
contribs/gnomd	0.00% <ø> (ø)
gno.land	61.69% <ø> (ø)
gnovm	42.21% <ø> (+0.30%)	⬆️
misc/autocounterd	0.00% <ø> (ø)
misc/genproto	0.00% <ø> (ø)
misc/genstd	73.90% <ø> (ø)
misc/goscan	0.00% <ø> (ø)
misc/logos	17.68% <ø> (ø)
misc/loop	0.00% <ø> (ø)
tm2	54.80% <ø> (+0.13%)	⬆️

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[thehowl]

BTW, I think nightly is better, master if it exists should be the latest commit on master...

[ajnavarro]

@thehowl I moved the tag from master to nightly, it makes much more sense.