[Fix] Install opencv for `merge_stage_test`

open-mmlab / mmgeneration

MMGeneration is a powerful toolkit for generative models, based on PyTorch and MMCV.

Apache License 2.0

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Checklist

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Codecov Report

Base: 74.81% // Head: 74.81% // No change to project coverage :thumbsup:

Coverage data is based on head (bded885) compared to base (4ed8fa2). Patch has no changes to coverable lines.

:exclamation: Current head bded885 differs from pull request most recent head b643c7c. Consider uploading reports for the commit b643c7c to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #480 +/- ## ======================================= Coverage 74.81% 74.81% ======================================= Files 145 145 Lines 11015 11015 Branches 2097 2097 ======================================= Hits 8241 8241 Misses 2233 2233 Partials 541 541 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `74.81% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-mmlab#carryforward-flags-in-the-pull-request-comment) to find out more. 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=open-mmlab). 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=open-mmlab)

open-mmlab / mmgeneration