Tweak file listing to omit `.git` directory #3637

Job	Run time
test-docker-build (base)	46s
e2e (v1.28.13, v0.56.8)	34m 49s
test-docker-build (git)	1m 15s
integration (v1.28.13, v0.56.8)	28m 37s
e2e (v1.28.13, v0.65.0)	34m 50s
unit	3m 28s
integration (v1.28.13, v0.65.0)	28m 45s
test-docker-build (image-processing)	48s
e2e (v1.31.0, v0.56.8)	34m 57s
test-docker-build (waiter)	37s
integration (v1.31.0, v0.56.8)	28m 58s
e2e (v1.31.0, v0.65.0)	37m 44s
integration (v1.31.0, v0.65.0)	29m 3s
	4h 24m 37s

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