bootloader: Chroot into composefs image root for bootupd installs #6986

Job	Run time
validate	15m 32s
cargo-deny	25s
docs	4m 32s
compute-ci-level	2s
Test install	1h 5m 5s
package (centos-10)	26m 57s
test-container-export	16m 49s
test-upgrade (centos-10, composefs)	27m 23s
test-baseconfigs (centos-10, root-transient)	13m 7s
test-baseconfigs (centos-10, var-volatile)	12m 48s
test-upgrade (centos-10, ostree)	19m 32s
test-baseconfigs (centos-10, etc-transient)	12m 49s
test-integration (centos-10, ostree, xfs, grub, bls, unsealed)	2h 44m 1s
test-integration (centos-10, composefs, xfs, systemd, bls, unsealed)	1h 50m 17s
test-integration (centos-10, composefs, ext4, systemd, bls, unsealed)	2h 1m 42s
test-integration (centos-10, composefs, ext4, grub, bls, unsealed)	1h 59m 50s
test-integration (centos-10, composefs, xfs, grub, bls, unsealed)	3h 48m 24s
test-integration (centos-10, composefs, ext4, systemd, uki, sealed)	51m 19s
test-integration (centos-10, composefs, xfs, systemd, uki, unsealed)	2h 5m 17s
test-coreos	0s
required-checks	3s
required-checks-merge	-1s
	18h 55m 53s

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