Feature Request: helloMMS Converge on one Dockerfile

[johnwalicki]

Is your feature request related to a problem? Please describe.

Using the technique described in #560 and implemented in #561
The same can be done for helloMMS

Many of the examples/ repos have Dockerfile.amd64 / Dockerfile.arm / Dockerfile.arm64 / Dockerfile.ppc64le
I did a meld on some of these Dockerfiles and they are slightly different. (which is not good)
These multiple Dockerfiles and differences are unnecessary. We could delete them all. Create one common Dockerfile

Then in the Makefile, tell the docker build --platform linux/$(ARCH)
Docker/Podman will figure out which arch image to pull and build.

Describe the solution you'd like.

Remove all the Dockerfile.* files. Create a common Dockerfile

[dipesh-rawat]

@johnwalicki Could you please assign this issue to me.
I had a go at making required changes for this issue and created a draft PR #574 with changes. If you could please review the same and let me know if anything is missing.

[johnwalicki]

@dipesh-rawat I have assigned this issue to you

[johnwalicki]

Thanks @dipesh-rawat

[johnwalicki]

This change has been released:
https://github.com/open-horizon/examples/releases/tag/v2.30.0-1142