Add permissions to build-core-uki release workflow #246

Job	Run time
get-core-matrix	9s
get-standard-matrix	40s
get-uki-matrix	10s
build-core (opensuse, opensuse, leap-15.5, core, generic, opensuse/leap:15.5, amd64, self-hosted)	36m 57s
build-core (opensuse, opensuse, tumbleweed, core, generic, opensuse/tumbleweed, amd64, self-hosted)	12m 53s
build-core (ubuntu, ubuntu, 20.04, core, generic, ubuntu:20.04, amd64, self-hosted)	12m 41s
build-core (ubuntu, ubuntu, 22.04, core, generic, ubuntu:22.04, amd64, self-hosted)	13m 19s
build-core (ubuntu, ubuntu, 23.10, core, generic, ubuntu:23.10, amd64, self-hosted)	12m 3s
build-core (alpine, alpine, 3.19, core, generic, alpine:3.19, amd64, self-hosted)	11m 34s
build-core (rhel, fedora, 38, core, generic, fedora:38, amd64, self-hosted)	10m 42s
build-core (debian, debian, testing, core, generic, debian:testing, amd64, self-hosted)	9m 26s
build-core (debian, debian, bookworm, core, generic, debian:bookworm-slim, amd64, self-hosted)	10m 6s
build-core (rhel, rockylinux, 9, core, generic, rockylinux:9, amd64, self-hosted)	9m 27s
build-core-uki (ubuntu, ubuntu, 23.10, core, generic, ubuntu:23.10, amd64, self-hosted)	7m 33s
build-core-uki (rhel, fedora, 38, core, generic, fedora:38, amd64, self-hosted)	7m 59s
	2h 35m 39s

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