[antithesis] Enable image build for multi-module repos #7777

Job	Run time
e2e_pre_etna	11m 39s
Fuzz	13m 38s
e2e_post_etna	11m 2s
Unit (macos-12)	4m 13s
Protobuf Lint	9s
Unit (ubuntu-20.04)	3m 12s
Unit (ubuntu-22.04)	6m 49s
Up-to-date protobuf	39s
e2e_existing_network	4m 12s
Unit (windows-2022)	7m 44s
Up-to-date mocks	2m 10s
Unit (custom-arm64-focal)	6m 34s
Up-to-date go.mod and go.sum	22s
Lint	3m 13s
Build Antithesis avalanchego images	8m 9s
Unit (custom-arm64-jammy)	12m 11s
Build Antithesis xsvm images	11m 37s
Image build	10m 34s
Upgrade	3m 18s
	2h 1m 25s

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