Reference request: $L^\infty(0,T;L^\infty(\Omega))$ is compactly embedded in $L^2(0,T;L^2(\Omega))$

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On a bounded domain $\Omega$, I am looking for a reference saying that $L^\infty(0,T;L^\infty(\Omega))$ is compactly embedded in $L^2(0,T;L^2(\Omega))$.

I tried all the usual texts (Showalter, Evans, Boyer & Fabrie..).