Use MUSL cross-build for ARM64 & dockers #2006

Job	Run time
Cross-platform builds	4m 35s
Build aarch64-apple-darwin	5m 41s
Build debian-x86_64	1m 48s
Build x86_64-apple-darwin	13m 55s
Build x86_64-pc-windows-msvc	12m 33s
Build x86_64-unknown-linux-gnu	14m 49s
Build docker images	1m 15s
Test x86_64-apple-darwin	7m 39s
Test x86_64-pc-windows-msvc	3m 51s
Test Legacy DB (postgis/postgis:11-3.0-alpine, postgres, disable)	3m 59s
Test x86_64-unknown-linux-gnu	12m 54s
Test Legacy DB (postgis/postgis:14-3.3-alpine, postgres, disable)	4m 14s
Test Legacy DB (postgis/postgis:15-3.3, postgres -c ssl=on -c ssl_cert_file=/etc/ssl/certs/ssl-ce...	4m 30s
Package aarch64-apple-darwin	9s
Package debian-x86_64	5s
Package x86_64-apple-darwin	11s
Package x86_64-pc-windows-msvc	16s
Package x86_64-unknown-linux-gnu	9s
Package aarch64-unknown-linux-musl	12s
Package x86_64-unknown-linux-musl	9s
CI Finished	2s
	1h 32m 56s

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