chore: Build on travis for PRs and push on master (#1457)
chore: Build on travis for PRs and push on master (#1457)

It will skip builds when pushing to other branches as they are building
the same things that the pull requests, and slow down the other builds.
cozy/cozy-files-v3,nono/cozy-files-v3,cozy/cozy-files-v3,cozy/cozy-files-v3,cozy/cozy-files-v3,nono/cozy-files-v3,nono/cozy-files-v3,nono/cozy-files-v3