Use railway docker image

[imedwei]

This blog post on the Railway website appears to offer a cleaner approach to running a deployment job using Railway's Docker image.

This seams preferrable to railway-deploy because one can issue the railway commands directly in the GitHub action instead of inside the entrypoint.sh.

[berviantoleo]

Yeah, seems they officially provided the docker image. Thanks for letting me know. I may archieve this repo.