Allow specifying only a tag or subtarget for images in config #4243

Job	Run time
cargo-deny	21s
check	24s
clippy (macos-latest)	23s
clippy (ubuntu-latest)	19s
generate-matrix	24s
clippy (windows-latest)	1m 16s
test (macos-latest)	1m 5s
test (ubuntu-latest)	1m 3s
test (windows-latest)	2m 16s
fmt	20s
shellcheck	9s
remote	2m 2s
docker-in-docker	3m 54s
bisect	4m 31s
target (${{ matrix.pretty }},${{ matrix.os }})	0s
foreign	2m 41s
podman	1m 54s
publish	0s
conclusion	1s
Coverage	13s
	23m 16s

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