GitHub Actions fix template literals in assets.yml #1825

Job	Run time
packages (arm64-secure, arm64)	3m 57s
packages (ubuntu-20.04, amd64)	5m 43s
packages (ubuntu-latest, riscv64)	4m 24s
manifest	5m 9s
eve (arm64, kvm)	41m 49s
verification (arm64, kvm)	12m 32s
eve (arm64, xen)	37m 38s
verification (arm64, xen)	11m 37s
eve (amd64, kvm)	42m 51s
eve (amd64, xen)	32m 43s
verification (amd64, kvm)	13m 51s
verification (amd64, xen)	10m 20s
eve (riscv64, mini)	4m 53s
trigger_assets	0s
	3h 47m 27s

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