API: Get release by tags endpoint

[johanvdw]

Get a release based on a tag name (for which a release exists).
Based on:
https://developer.github.com/v3/repos/releases/#get-a-release-by-tag-name

This is a useful feature for deploy scripts.

Note I'm new to gitea and go in general, so please review carefully.

[6543]

some tests missing
-> https://github.com/go-gitea/gitea/blob/master/integrations/api_releases_test.go

just add 2 api calls: (Get Existing Release, Get Not Existing Release)
and check result :)

Existing Releases it tests: https://github.com/go-gitea/gitea/blob/master/models/fixtures/release.yml

[codecov-commenter]

Codecov Report

Merging #12932 into master will increase coverage by 0.12%.
The diff coverage is 68.75%.

@@            Coverage Diff             @@
##           master   #12932      +/-   ##
==========================================
+ Coverage   42.71%   42.84%   +0.12%     
==========================================
  Files         661      662       +1     
  Lines       72986    73002      +16     
==========================================
+ Hits        31177    31277     +100     
+ Misses      36760    36656     -104     
- Partials     5049     5069      +20     

Impacted Files	Coverage Δ
routers/api/v1/repo/release_tags.go	61.53% <61.53%> (ø)
routers/api/v1/api.go	79.35% <100.00%> (+0.09%)	⬆️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
modules/git/repo_commit.go	50.54% <0.00%> (-0.73%)	⬇️
models/error.go	34.34% <0.00%> (-0.68%)	⬇️
routers/repo/view.go	37.47% <0.00%> (-0.65%)	⬇️
modules/indexer/stats/db.go	52.17% <0.00%> (ø)
services/pull/pull.go	41.27% <0.00%> (+0.49%)	⬆️
... and 15 more

---

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[johanvdw]

some tests missing
-> https://github.com/go-gitea/gitea/blob/master/integrations/api_releases_test.go

just add 2 api calls: (Get Existing Release, Get Not Existing Release)
and check result :)

Existing Releases it tests: https://github.com/go-gitea/gitea/blob/master/models/fixtures/release.yml

Thanks for the pointer, I was looking for the tests. I will add them.

[6543]

You need to commit result of make generate-swagger again :)

[6543]

@johanvdw It's feature freeze, so we have to wait for 1.13.0 RC1

to merge this :)

[zeripath]

meh if it's ready - it's ready. I'm happy to merge into 1.13 given it's self-contained.