Building an existing version no longer gracefully exits

[lars-petter-hauge]

Given example 1

$ deploy build config.yaml
Building hello-1.0.0...
hello> + echo 'src: binary.sh'
hello> + echo 'out: output/prefix/.store/b033b3db0f59c98af8760ed4da70204c0ba56fc6-hello-1.0.0'
hello> + mkdir -p output/prefix/.store/b033b3db0f59c98af8760ed4da70204c0ba56fc6-hello-1.0.0/bin
hello> src: binary.sh
hello> out: output/prefix/.store/b033b3db0f59c98af8760ed4da70204c0ba56fc6-hello-1.0.0
hello> + cp binary.sh output/prefix/.store/b033b3db0f59c98af8760ed4da70204c0ba56fc6-hello-1.0.0/bin/
Created symlink: output/prefix/1.0.0 -> 1.0.0-1
Created symlink: output/prefix/1.0 -> 1.0.0
Created symlink: output/prefix/1 -> 1.0
Created symlink: output/prefix/latest -> 1.0.0-1
Created symlink: output/prefix/stable -> latest
$ deploy build config.yaml
Ignoring hello-1.0.0: Already built at output/prefix/.store/b033b3db0f59c98af8760ed4da70204c0ba56fc6-hello-1.0.0
Environment already exists at output/prefix/1.0.0-1
Traceback (most recent call last):
  File "/Users/LPHA/GitProjects/cirrus-deploy/.venv/bin/deploy", line 10, in <module>
    sys.exit(cli())
             ^^^^^
  File "/Users/LPHA/GitProjects/cirrus-deploy/.venv/lib/python3.11/site-packages/click/core.py", line 1485, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/LPHA/GitProjects/cirrus-deploy/.venv/lib/python3.11/site-packages/click/core.py", line 1406, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/Users/LPHA/GitProjects/cirrus-deploy/.venv/lib/python3.11/site-packages/click/core.py", line 1873, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/LPHA/GitProjects/cirrus-deploy/.venv/lib/python3.11/site-packages/click/core.py", line 1269, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/LPHA/GitProjects/cirrus-deploy/.venv/lib/python3.11/site-packages/click/core.py", line 824, in invoke
    return callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/LPHA/GitProjects/cirrus-deploy/src/deploy/commands/build.py", line 323, in subcommand_build
    builder.build()
  File "/Users/LPHA/GitProjects/cirrus-deploy/src/deploy/commands/build.py", line 232, in build
    self._build_envs()
  File "/Users/LPHA/GitProjects/cirrus-deploy/src/deploy/commands/build.py", line 242, in _build_envs
    assert path is not None
           ^^^^^^^^^^^^^^^^
AssertionError