Tests

Switch to external composefs #1947

Job	Run time
Build (Fedora)	49s
Build (C9S)	54s
build-integration	4m 3s
Code style	41s
Build - FCOS minimal	50s
Debian Stable with sign-ed25519 and FUSE 2	1m 5s
Debian Stable with curl, sign-ed25519, no gpgme, FUSE 3	1m 3s
Debian Stable 32 bit	1m 17s
Debian Stable without libsystemd	1m 1s
Debian Testing	1m 5s
Debian Testing with libsoup3	1m 8s
Debian stable + static-prepareroot	2m 41s
Ubuntu Latest Release	1m 0s
Privileged testing	0s
	17m 37s

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