Add gpg-agent package, required by coverage jobs (#13) #99

Job	Run time
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 12)	1m 34s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 16)	1m 38s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 12)	2m 24s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 18)	1m 51s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 13)	1m 38s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 20)	2m 21s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 18)	1m 27s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 17)	2m 2s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 17)	1m 29s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 19)	1m 35s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 16)	1m 57s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 14)	1m 53s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 20)	1m 42s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 14)	1m 38s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 19)	2m 21s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 13)	2m 33s
merge (bookworm, gcc, 14)	18s
merge (bookworm, clang, 19)	14s
merge (bookworm, gcc, 12)	17s
merge (bookworm, gcc, 13)	24s
merge (bookworm, clang, 17)	17s
merge (bookworm, clang, 18)	16s
merge (bookworm, clang, 16)	21s
merge (bookworm, clang, 20)	11s
	32m 21s

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