chore: don't include prereleases in docker latest tag

[atzoum]

Description

Only releases should update the latest tag in rudder-server's docker image

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Base: 52.95% // Head: 52.79% // Decreases project coverage by -0.16% ⚠️

Coverage data is based on head (cc894d8) compared to base (47a12bd).
Patch has no changes to coverable lines.

❗ Current head cc894d8 differs from pull request most recent head 774560f. Consider uploading reports for the commit 774560f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3006      +/-   ##
==========================================
- Coverage   52.95%   52.79%   -0.16%     
==========================================
  Files         338      338              
  Lines       52099    52119      +20     
==========================================
- Hits        27587    27517      -70     
- Misses      22897    22986      +89     
- Partials     1615     1616       +1     

Impacted Files	Coverage Δ
processor/stash/stash.go	45.25% <0.00%> (-21.54%)	⬇️
utils/logger/nop.go	52.63% <0.00%> (-5.27%)	⬇️
jobsdb/migration.go	73.96% <0.00%> (-4.39%)	⬇️
...rprise/suppress-user/internal/badgerdb/badgerdb.go	83.00% <0.00%> (-0.50%)	⬇️
processor/processor.go	86.87% <0.00%> (-0.41%)	⬇️
jobsdb/backup.go	75.40% <0.00%> (-0.36%)	⬇️
warehouse/identities.go	1.04% <0.00%> (-0.01%)	⬇️
warehouse/utils/utils.go	70.07% <0.00%> (ø)
warehouse/integrations/postgres/postgres.go	26.18% <0.00%> (ø)
warehouse/schema.go	54.44% <0.00%> (+1.62%)	⬆️
... and 1 more

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