Revert "set GIT_AUTH_TOKEN secret if Git context used" #2179

Job	Run time
annotations-disabled	15s
allow (v0.19.0-rc2)	17s
bake (default)	23s
allow (v0.18.0)	17s
checks (latest)	15s
docker-config-malformed	13s
bake (release)	32s
allow (v0.17.1)	15s
checks (v0.14.1)	14s
error-check	6s
git-context	1m 16s
error-msg	4s
git-context-and-local	1m 18s
group	15s
load-and-push	30s
multi-output	29s
provenance	15s
provenance (mode=max)	26s
proxy-buildkitd	25s
proxy-docker-config	31s
provenance (builder-id=foo)	16s
record-retention-days (2)	17s
record-retention-days (0)	24s
record-upload-disable	16s
remote	1m 0s
sbom (image, type=image,name=localhost:5000/name/app:latest,push=true)	21s
set	28s
standalone	16s
sbom (binary, /tmp/bake-build)	30s
summary-disable	9s
summary-disable-deprecated	10s
summary-not-supported	17s
provenance (false)	19s
provenance (true)	15s
	13m 14s

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