Proposal: add build args to docker-build action

Nadie ha tomado este issue todavía.

Currently, our `docker-build` action does not support passing --build-arg parameters to the docker build command. This limits our ability to dynamically inject build-time variables such as environment configurations, secrets (via build-time only secrets), or versioning metadata.

Proposal:

Add support for build arguments by introducing an optional build-args input to the action. This input could accept a list or key-value pairs, which the action will forward to the docker build command using --build-arg.

Example usage:

```
with:
build-args: |
ENV=production
VERSION=1.2.3
```

This enhancement would improve flexibility and align the action with common Docker build practices.

Localiza la definición de la acción docker-build y el comando docker build que invoca. Añade la entrada opcional build-args con el formato propuesto ENV=production, pasa cada argumento como --build-arg y verifica que las compilaciones sin la entrada sigan funcionando.

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