add .gitignore for deb-builder.sh in Docker directory #1816

Job	Run time
Run functional tests on Linux (ciGroup1)	18m 35s
Run functional tests on Linux (ciGroup2)	29m 11s
Lint and validate	8m 17s
Build and Verify on Linux (ciGroup1)	33m 39s
Run functional tests on Linux (ciGroup4)	36m 21s
Build and Verify on Linux (ciGroup2)	14m 32s
Run functional tests on Linux (ciGroup6)	17m 44s
Build min release artifacts on Linux x64	17m 14s
Build and Verify on Linux (ciGroup3)	24m 4s
Run plugin functional tests on Linux	21m 25s
Build min release artifacts on Linux ARM64	17m 18s
Run functional tests on Linux (ciGroup7)	26m 2s
Build and Verify on Linux (ciGroup4)	19m 42s
Run functional tests on Linux (ciGroup8)	26m 37s
Run functional tests on Linux (ciGroup9)	23m 51s
Run functional tests on Linux (ciGroup10)	28m 24s
Run functional tests on Linux (ciGroup11)	36m 15s
Run functional tests on Linux (ciGroup13)	16m 13s
Run backwards compatibility tests (osd-2.0.0)	1m 35s
Run backwards compatibility tests (osd-2.1.0)	1m 42s
Run backwards compatibility tests (osd-2.2.0)	1m 36s
Run backwards compatibility tests (osd-2.3.0)	1m 34s
Run backwards compatibility tests (osd-2.4.0)	1m 32s
Run backwards compatibility tests (osd-2.5.0)	1m 33s
Run backwards compatibility tests (osd-2.6.0)	1m 34s
Run backwards compatibility tests (osd-2.7.0)	1m 29s
Run backwards compatibility tests (osd-2.8.0)	1m 35s
Run backwards compatibility tests (osd-2.9.0)	1m 34s
	7h 11m 8s

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