Fix invalid release_docker.yml

[akihironitta]

What does this PR do?

Fixes the invalid workflow file for releasing docker images.

I was looking at some recent logs of release_docker.yml, and it turned out that the workflow hadn't run successfully for a few months since the change in #10075 with this error message:

Invalid workflow file: .github/workflows/release-docker.yml#L42
The workflow is not valid. .github/workflows/release-docker.yml (Line: 42, Col: 13): Unexpected symbol: '"3'. Located at position 26 within ...

It seems like ' has to be used within if block in GHA workflow file, which I confirmed in my toy repo here:

• with " https://github.com/akihironitta/playground/actions/runs/1833100590
• with ' https://github.com/akihironitta/playground/actions/runs/1833102339

Does your PR introduce any breaking changes? If yes, please list them.

None

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cc @carmocca @akihironitta @Borda

[akihironitta]

Just realised that #11819 includes this fix, so closing this PR.