ci: missing concurrency checks #1212

Job	Run time
error	1m 10s
error-buildx	24s
example	16s
git-context	21s
git-context-secret	15s
minimal	10s
path-context	29s
add-hosts	14s
attests-compat (latest, moby/buildkit:buildx-stable-1)	26s
attests-compat (latest, moby/buildkit:v0.10.6)	31s
attests-compat (v0.9.1, moby/buildkit:buildx-stable-1)	38s
cgroup-parent	23s
digest (docker, true, false)	27s
digest (docker, false, true)	15s
digest (docker, false, false)	16s
digest (docker-container, true, false)	20s
digest (docker-container, false, true)	15s
digest (docker-container, false, false)	14s
docker-driver	11s
export-docker	6s
github-cache	17s
multi (multi)	20s
multi (multi-sudo)	40s
named-context-container	21s
named-context-pin	17s
network	13s
named-context-docker	12s
no-cache-filters	17s
provenance	10s
provenance (mode=max)	12s
provenance (builder-id=foo)	18s
provenance (false)	20s
provenance (true)	14s
proxy-buildkitd	25s
proxy-docker-config	37s
registry-cache	33s
sbom (image, type=image,name=localhost:5000/name/app:latest,push=true)	14s
sbom (binary, /tmp/buildx-build)	36s
secret	9s
shm-size	11s
standalone	32s
ulimit	17s
	14m 46s

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