This commit refactors travisBuild.sh to support building pushed branched on top
of PRs and tags.
This was prompted by enabling travis on a forked repository. The devlopment
flow then becomes:
- Fork google/go-jsonnet
- Enable travis on fork repository
- Push branch to forked repository
- Travis runs on the pushed branch
- Submit pull request once happy and tests pass in the forked repository
I tested 3 scenarii and they seem behave nicely:
- Running CI for pushed branch
- Running CI for tag
- Running CI for a Pull Request
As a side note, the previous error path didn't work as intented:
- The TRAVIS_PULL variable didn't exist
- We weren't exiting with a non 0 value in the else branch, so the build
succeeded instead of failing when travisBuild.sh didn't know what to do
with the pushed branch
Given the <tag> chosen in the GitHub releases page, this builds jsonnet
for darwin & linux amd64 (we can add more if needed), and uploads to
gs://jsonnet/<tag>/<os>/<arch>/jsonnet
