tests: Fix examples-build to work on non-fsverity hosts

I'm changing the default fs for Fedora in our CI to be xfs arbitrarily.
This code SHOULD work on non-fsverity hosts, and the other
code path in `tests/build-sealed` does.

Also, the remainder of the stuff was dead code so just drop it.

Signed-off-by: Colin Walters <[email protected]>

Author: cgwalters

tmt/tests/examples/bootc-uki/build.final

@@ -9,9 +9,10 @@ cp /usr/bin/bootc .
 rm -rf tmp/sysroot
 mkdir -p tmp/sysroot/composefs
 
+# TODO port this over to container compute-composefs-digest
 IMAGE_ID="$(sed s/sha256:// tmp/iid)"
-./bootc internals cfs --repo tmp/sysroot/composefs oci pull containers-storage:"${IMAGE_ID}"
-COMPOSEFS_FSVERITY="$(./bootc internals cfs --repo tmp/sysroot/composefs oci compute-id --bootable "${IMAGE_ID}")"
+./bootc internals cfs --repo tmp/sysroot/composefs --insecure oci pull containers-storage:"${IMAGE_ID}"
+COMPOSEFS_FSVERITY="$(./bootc internals cfs --repo tmp/sysroot/composefs --insecure oci compute-id --bootable "${IMAGE_ID}")"
 
 # See: https://wiki.archlinux.org/title/Unified_Extensible_Firmware_Interface/Secure_Boot
 # Alternative to generate keys for testing: `sbctl create-keys`
@@ -37,9 +38,3 @@ sudo podman build \
     --secret=id=key,src=secureboot/db.key \
     --secret=id=cert,src=secureboot/db.crt \
     --iidfile=tmp/iid2
-
-rm -rf tmp/efi
-mkdir -p tmp/efi
-./bootc internals cfs --repo tmp/sysroot/composefs oci pull containers-storage:"${IMAGE_ID}"
-./bootc internals cfs --repo tmp/sysroot/composefs oci compute-id --bootable "${IMAGE_ID}"
-./bootc internals cfs --repo tmp/sysroot/composefs oci prepare-boot "${IMAGE_ID}" --bootdir tmp/efi