(cherry-pick) Rancher specfic changes

* replace upstream's workflow with Rancher's workflow files and add FOSSA

* cherry pick commits: f327746, b8966a6
refactor rancher build process due to upstream changes and update docker version and buildx version

* fix drone build failure

`go install ginkgo` followed by `which ginkgo` is newly added in the upstream repo.
This is making the drone build fail for arm64 arch. The ginkgo library
gets installed under $GOPATH/bin/linux_arm64 dir. This is unlike amd64 images
which typically install go libraries under $GOPATH/bin. Since the previously mentioned
dir is not in PATH, the command `which ginkgo` fails. I've added this location to PATH
to fix the build failure. See upstream PRs linked below for more info:
kubernetes#8566
kubernetes#8569

* Fix flaky arm64 emulator issue docker/buildx#542

Signed-off-by: Chirayu Kapoor <chirayu.kapoor@suse.com>