Token recognition error when Earthfile ends with a commented line

[visciang]

To reproduce: https://github.com/visciang/issue-earthly

❯ earthly +foo
           buildkitd | Found buildkit daemon as docker container (earthly-buildkitd)
line 4:0 token recognition error at: '# comment last line '
line 4:0 token recognition error at: '# comment last line '
              alpine | --> Load metadata linux/amd64
                +foo | --> FROM alpine
                +foo | [██████████] resolve docker.io/library/alpine@sha256:3c7497bf0c7af93428242d6176e8f7905f2201d8fc5861f45be7a346b5f23436 ... 100%
              output | --> exporting outputs
              output | [██████████] sending tarballs ... 100%
=========================== SUCCESS ===========================