GitLab

Add the possibility to change SSH Port and SSH User

# Conflicts:
#	.github/workflows/manual-build.yml
#	driver.go
#	go.sum

feat: add placement groups

- documentation
- update readme for next version

- add placement groups using --hetzner-placement-group
- auto-created pgs will be deleted with the last server within them
- added --hetzner-auto-spread for a driver-managed placement group

Closes: #72

- download links
- document #69

Resolve #69: add flag to define key labels

Break up server creation logic + some doc comments

- add arm64 architecture for M1 based Macs (thanks @cedricziel)

To make goreleaser recognize arm64, use go 1.16 here as well.

devops(ci): added basic GitHub Actions

- show some love to windows users

- build only master by default
- allow manual builds
- disable CGO

- remove travis
- fix array literal

Add support for firewalls

- added --hetzner-server-label option, closes #56

- closes #55: 'main' ssh key should be deleted corretly again