set GIT_AUTH_TOKEN secret if Git context used #2170

Job	Run time
bake (default)	20s
bake (release)	19s
error-msg	4s
provenance	14s
provenance (mode=max)	24s
provenance (builder-id=foo)	29s
provenance (false)	14s
remote	1m 2s
provenance (true)	24s
sbom (image, type=image,name=localhost:5000/name/app:latest,push=true)	18s
standalone	17s
sbom (binary, /tmp/bake-build)	17s
docker-config-malformed	12s
git-context	11s
git-context-and-local	1m 27s
group	15s
load-and-push	28s
multi-output	39s
proxy-buildkitd	20s
proxy-docker-config	19s
set	26s
summary-disable	10s
allow (v0.19.0-rc2)	15s
allow (v0.18.0)	15s
allow (v0.17.1)	13s
annotations-disabled	15s
checks (latest)	15s
error-check	6s
checks (v0.14.1)	22s
record-retention-days (2)	27s
record-retention-days (0)	14s
record-upload-disable	15s
summary-disable-deprecated	15s
summary-not-supported	18s
	11m 59s

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