chore(docker): add more ignore to `.dockerignore` to increase context archive setup

[fuxingloh]

What this PR does / why we need it:

As per title, to assist with #61 build durations. For better DX.

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[codecov[bot]]

Codecov Report

Base: 6.43% // Head: 89.47% // Increases project coverage by +83.04% :tada:

Coverage data is based on head (1419c08) compared to base (dbbc296). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #161 +/- ## ========================================== + Coverage 6.43% 89.47% +83.04% ========================================== Files 14 4 -10 Lines 1804 57 -1747 Branches 3 3 ========================================== - Hits 116 51 -65 + Misses 1688 6 -1682 ``` | [Impacted Files](https://codecov.io/gh/DeFiCh/metachain/pull/161?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh) | Coverage Δ | | |---|---|---| | [meta/meta-runtime/src/tests.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLXJ1bnRpbWUvc3JjL3Rlc3RzLnJz) | | | | [meta/meta-runtime/src/mock.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLXJ1bnRpbWUvc3JjL21vY2sucnM=) | | | | [meta/meta-node/src/cli.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLW5vZGUvc3JjL2NsaS5ycw==) | | | | [meta/meta-node/src/service.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLW5vZGUvc3JjL3NlcnZpY2UucnM=) | | | | [meta/meta-node/src/main.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLW5vZGUvc3JjL21haW4ucnM=) | | | | [meta/meta-consensus/src/lib.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLWNvbnNlbnN1cy9zcmMvbGliLnJz) | | | | [meta/meta-node/src/rpc.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLW5vZGUvc3JjL3JwYy5ycw==) | | | | [meta/meta-node/src/chain\_spec.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLW5vZGUvc3JjL2NoYWluX3NwZWMucnM=) | | | | [meta/meta-node/src/command.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLW5vZGUvc3JjL2NvbW1hbmQucnM=) | | | | [meta/meta-runtime/src/lib.rs](https://codecov.io/gh/DeFiCh/metachain/pull/161/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh#diff-bWV0YS9tZXRhLXJ1bnRpbWUvc3JjL2xpYi5ycw==) | | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DeFiCh)

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