chore(common): add root .dockerignore to reduce build context size (#… #922

Job	Run time
check-changes	8s
re-tag-tx-sender-image / prepare-image-tags	4s
re-tag-zkproof-worker-image / prepare-image-tags	6s
re-tag-sns-worker-image / prepare-image-tags	5s
re-tag-host-listener-image / prepare-image-tags	3s
re-tag-gw-listener-image / prepare-image-tags	5s
build-tfhe-worker	0s
build-gw-listener	0s
re-tag-tfhe-worker-image / prepare-image-tags	5s
re-tag-db-migration-image / prepare-image-tags	6s
build-zkproof-worker	0s
build-db-migration	0s
build-host-listener	0s
build-sns-worker	0s
build-tx-sender	0s
re-tag-host-listener-image / re-tag-image	13s
re-tag-tx-sender-image / re-tag-image	17s
re-tag-gw-listener-image / re-tag-image	12s
re-tag-sns-worker-image / re-tag-image	10s
re-tag-db-migration-image / re-tag-image	11s
re-tag-tfhe-worker-image / re-tag-image	16s
re-tag-zkproof-worker-image / re-tag-image	16s
	2m 17s

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