Add libatomic1 when building on linux/arm/v5. #1390

Job	Run time
Load Jobs Settings / Disabled Actions	6s
Lean Build	0s
Full Build	0s
Functional Testing	0s
Build Packages	0s
Glitch Injection	0s
Fuzz with OSS-Fuzz	-1s
Build&Push to DockerHub (debian:13-slim, latest-debian-13)	1h 5m 36s
Build&Push to DockerHub (ubuntu:latest, latest-ubuntu-24.04)	2m 10s
Build&Push to DockerHub (debian:12-slim, latest-debian-12)	1h 7m 23s
Roll Release	0s
	2h 15m 14s

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