Use maxperf profile when building Lighthouse from source

[jimmygchen]

Lighthouse official binaries & images are built using the maxperf profile to enable further optimizations, so it might be worth changing the Dockerfile for source builds to use the same, depending on what user uses the source build feature for - if using it for comparative testing with stable or running a validator, it probably makes sense to enable maxperf.

From Lighthouse book:

maxperf: default for binary releases, enables aggressive optimisations including full LTO. Although compiling with this profile improves some benchmarks by around 20% compared to release, it imposes a significant cost at compile time and is only recommended if you have a fast CPU.

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