I have several images (3rd parties) which eg setup a mysql, set up a generic php app environment, set up 3rd parties tools.
I want to make a Dockerfile / Docker Imag
Since dependencies from seconds and third image can conflict with dependencies from first image, I don't think docker would able to support it.
I guess the only option is to start your image from 1 of them an then install/run all of the steps from 2 others:
FROM imageA
RUN .... commands for imageV
RUN .... commands for imageX