Railway URL (railwayapp#107)

* Railway URL

* Update .goreleaser.yml

* Move to URL constant file

* Remove LDFlags for now

Newline for Version cmd (railwayapp#111)

* Newline for Version cmd

* Verbose Ephemeral Text

Newline for Version cmd (railwayapp#111)

* Newline for Version cmd

* Verbose Ephemeral Text

Clear ephemeral before teardown (railwayapp#110)

Remove arg check for now (railwayapp#109)

Remove arg check for now (railwayapp#109)

One-Off Environments from CLI (railwayapp#101)

* Create environments from CLI, including ephemeral ones

Update install.sh (railwayapp#108)

return exit code or 1 if run command failed

Add vars alias for variables command (railwayapp#102)