chore: put context keep dir within the bake definition #2163

Job	Run time
error-check	5s
bake (default)	23s
error-msg	7s
bake (release)	23s
standalone	19s
provenance	24s
remote	1m 16s
provenance (mode=max)	13s
set	33s
provenance (builder-id=foo)	31s
sbom (image, type=image,name=localhost:5000/name/app:latest,push=true)	22s
docker-config-malformed	20s
provenance (false)	27s
sbom (binary, /tmp/bake-build)	22s
provenance (true)	17s
git-context	1m 14s
group	15s
proxy-buildkitd	19s
proxy-docker-config	34s
git-context-and-local	1m 23s
load-and-push	32s
multi-output	35s
record-retention-days (2)	20s
record-upload-disable	30s
record-retention-days (0)	34s
summary-disable	23s
summary-not-supported	10s
summary-disable-deprecated	12s
allow (v0.19.0-rc2)	14s
allow (v0.18.0)	14s
allow (v0.17.1)	27s
annotations-disabled	21s
checks (latest)	33s
checks (v0.14.1)	15s
	15m 7s

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