feat: geant4 with eAST physics list

This adds geant4 with backported eAST physics list.

assigned to @wdconinc

added 1 commit

• 146afbe1 - fix: eic-spack v0.20.12

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enabled an automatic merge when the pipeline for 146afbe1 succeeds

aborted the automatic merge because target branch was updated

added 3 commits

• f39770e7 - 1 commit from branch master
• c4ce0bfe - feat: geant4 with eAST physics list
• 995b49d4 - fix: eic-spack v0.20.12

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merged