add missing dcap arg within dockerfile #7881

Job	Run time
sequentialise	3s
parachain-dynamic-contract-test	17s
set-condition	11s
fmt	1m 5s
parachain-build-dev	6m 31s
tee	23m 3s
bitacross	15m 44s
bitacross-build	25m 44s
parachain-clippy	0s
parachain-unit-test	0s
parachain-runtime-test	0s
identity-build	13m 40s
litmus	1m 13s
litentry	1m 12s
rococo	3m 51s
lit-di-bitcoin-identity-multiworker-test	11m 39s
lit-di-substrate-identity-test	10m 22s
lit-di-evm-identity-multiworker-test	11m 49s
lit-di-evm-identity-test	6m 57s
lit-di-solana-identity-multiworker-test	11m 50s
lit-di-bitcoin-identity-test	6m 35s
lit-di-substrate-identity-multiworker-test	14m 17s
lit-di-solana-identity-test	7m 12s
lit-di-vc-multiworker-test	22m 27s
lit-dr-vc-multiworker-test	13m 26s
lit-di-vc-test	18m 52s
lit-dr-vc-test	8m 48s
lit-resume-worker	11m 31s
lit-parentchain-nonce	6m 1s
lit-test-failed-parentchain-extrinsic	8m 24s
lit-twitter-identity-test	7m 9s
lit-discord-identity-test	7m 19s
lit-assertion-contracts-test	7m 16s
lit-sign-bitcoin	8m 46s
push-docker	0s
	4h 53m 14s

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