How to set the julia optimization level for each run on Github Actions?

General Usage
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I have this script, where I have the following matrix:

matrix:
        julia-version: ['1', '1.6', '~1.9.0-0']

and the following command to launch julia

        shell: julia --color=yes --project=downstream {0}

I want to specify an optimization level -O0 for the runs on julia versions v1 and v1.9, but not for v1.6. I am not that familiar with GitHub actions, and I was wondering if someone could suggest a way to achieve this?