WIP: add --dockerfile option to allow specifying custom dockerfiles

[bopete1313]

Added an option to specify a custom dockerfile with --dockerfile.

[flowzone-app]

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https://github.com/balena-io/deploy-to-balena-action/actions/runs/15172649286

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[bopete1313]

Hi,

I followed the changes in the following to guide my changes:
aa666fb

My code does not seem to be working. I changed my docker-compose.yml to docker-compose-test.yml and set the input in my workflow but received:

Error:     Could not detect project type: Service main: package.json: engines.node must be specified
Error:     Not deploying release.
Error: Remote build failed

Did I miss a change somewhere? Any help would be appreciated. Also, please let me know if I'm not following the contribution process correctly, it's my first time.

[bopete1313]

Ah! I've since realized that the --dockerfile option doesn't also work with docker-compose files which was my original goal. I don't really need multiple Dockerfile support right now. I can delete this PR or you guys could keep it and take it from here if you wanted. I just haven't tested Dockerfile's by themselves, we use docker-compose.

Sorry for the noise.