Trim image sizes removing unneded stuff

For instance,
```
(eamxx-venv) bash-5.1# du -h --max-depth=1 / 2> /dev/null | grep moab
3.4G /moab-build
```
these are 3.4G that we 100% don't use/need. Moab also builds several binaries, each around 70M, and we probably only need a subset of those.

Another thing to consider is to switch to shared libs for moab (we currently build static libs).