use defconfig for ct-ng, minimizing the config #4184

Job	Run time
check	25s
cargo-deny	20s
fmt	20s
clippy (macos-latest)	1m 13s
clippy (ubuntu-latest)	21s
generate-matrix	13s
shellcheck	10s
clippy (windows-latest)	1m 2s
test (macos-latest)	1m 28s
test (ubuntu-latest)	1m 8s
test (windows-latest)	3m 14s
foreign	2m 55s
remote	1m 53s
bisect	3m 40s
target (${{ matrix.pretty }},${{ matrix.os }})	0s
docker-in-docker	3m 52s
podman	2m 13s
publish	0s
conclusion	1s
Coverage	13s
	24m 41s

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