Use WORKDIR instead of RUN.

[drobati]

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The RUN mkdir /opt/app command is not necessary and can lead to an extra layer in your Docker image, which is not recommended for Docker best practices.

Instead of creating the directory with a RUN command, you can use the WORKDIR directive, which will create the directory if it does not exist. Replace the RUN mkdir /opt/app line with WORKDIR /opt/app.

Originally posted by @codereviewbot-ai[bot] in #85 (comment)