* Run GitHub Actions on pushes and PRs to main, not master
* fix go install ecr-login, bump to latest v0.6.0
* master -> main in some integration tests
* skip no-ref integration test
* Collapse integration test workflows into one config
Remove last traces of Travis, including env vars and `make travis-setup`
and badges in README
* fix lint
* make integration tests pass on PRs
On my machine this makes image rebuilds go from ~5m to 1.5s.
This also required setting DOCKER_BUILDKIT=1 in integration test image
builds.
I also took the opportunity to bump the Go version used in those tests
to Go 1.17 to match the image build processes, and tidied up the
workflow files a bit too (renaming for consistency, typos, whitespace,
etc.)
Jason Hall