misrepresentation of version

Hi!

I think this is a bug introduced with the multistage build:

When I run

`docker run cytopia/checkmake:latest checkmake --version`

it yields

`checkmake 0.2.2 built at 2023-06-05T04:27:55Z ...`

whilst the expected output should be something among the lines of

`checkmake 0.5 ...`

Thanks!