fix: preserve git info for docker image in +source #2251

Job	Run time
build-macos-x86_64	18m 41s
build-linux-pre-merge	0s
build-macos-arm64	19m 46s
build-linux-post-merge	3m 26s
build-macos-arm64-workflow-dispatch	0s
build-macos-x86_64-workflow-dispatch	0s
build-linux-workflow-dispatch	0s
local-environment-tests	0s
upload-chain-specs-pre-merge	0s
devshell-tests	0s
upload-chain-specs-workflow-dispatch	0s
upload-to-s3-workflow-dispatch	0s
local-environment-tests-alert	0s
pre-merge-checks-complete	0s
workflow-dispatch-flow-complete	0s
deploy-rustdoc	2m 13s
local-environment-tests-post-merge	9m 37s
upload-chain-specs	21s
local-environment-tests-post-merge-alert	14s
deploy-ci-preview	3m 15s
post-merge-actions-complete	1s
upload-to-s3	33s
	58m 7s

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