arm64 Docker cleanup #10232

Job	Run time
python linting	32s
spelling	6s
validate commits	9s
Generate build matrix	7s
bookworm - test-install	12m 16s
bookworm - 32 bit	13m 6s
noble - test-install	12m 49s
el9 - test-install	12m 8s
alpine - test-install	12m 30s
fedora40 - test-install	11m 54s
jammy - test-install	11m 40s
focal - py3.8	17m 25s
bookworm - gcc-12,content-s3,distcheck	20m 10s
fedora40 - clang-18	16m 42s
coverage	24m 7s
el8 - ascii	19m 26s
el8 - test-install	13m 51s
el8 - system,coverage	7m 6s
inception	21m 13s
flux-pmix check	13m 17s
flux-accounting check	4m 51s
macos build only	3m 4s
flux-pam check	4m 8s
flux-sched check	6m 45s
Generate docker manifest	1s
	4h 19m 23s

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