Add Container Automation

[ax3l]

Add automated docker containers:

• developer environment (CPU)
• GPU user environment (Nvidia, e.g., Perlmutter, Summit, Frontier) w/ cupy and numba
  • OLCF: https://docs.olcf.ornl.gov/software/containers_on_summit.html
  • NERSC: https://docs.nersc.gov/development/shifter/
• GPU user environment and selected ML packages
• pre-build ImpactX