enhance(build): return build on CreateBuild and UpdateBuild

[ecrupper]

Part of the effort for https://github.com/go-vela/community/issues/613. It would be helpful to not have to make two calls to the database during our webhook process. This can be remedied by returning the created build object when it's saved to the database.

[codecov[bot]]

Codecov Report

Merging #701 (bfdcac6) into main (71240b4) will decrease coverage by 2.99%. The diff coverage is 42.10%.

:exclamation: Current head bfdcac6 differs from pull request most recent head 38bd752. Consider uploading reports for the commit 38bd752 to get more accurate results

@@            Coverage Diff             @@
##             main     #701      +/-   ##
==========================================
- Coverage   58.08%   55.10%   -2.99%     
==========================================
  Files         255      201      -54     
  Lines       15876    15972      +96     
==========================================
- Hits         9222     8801     -421     
- Misses       6249     6789     +540     
+ Partials      405      382      -23     

Impacted Files	Coverage Δ
api/build.go	1.65% <0.00%> (+0.17%)	:arrow_up:
api/webhook.go	0.00% <0.00%> (ø)
database/postgres/build.go	91.17% <50.00%> (-4.69%)	:arrow_down:
database/sqlite/build.go	91.17% <50.00%> (-4.69%)	:arrow_down:

... and 149 files with indirect coverage changes

[ecrupper]

closing because this has become a mess. Will just use a new branch