build: LTO profile 'thin' and moved to Cargo.toml

It makes more sense to set the release LTO profile into the related Cargo.toml section than into the Dockerfile only.

Using LTO 'thin' profile because according to the documentation it is a good compromise with no or little performance loss.

added RN-silent label

added 2 commits

• 70ac32cd - 1 commit from branch master
• f084d3a7 - build: LTO profile 'thin' and moved to Cargo.toml

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marked this merge request as ready

requested review from @HugoTrentesaux

added 1 commit

• cf4ed969 - build: LTO profile 'thin' and moved to Cargo.toml

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added 3 commits

• cf4ed969...10170f2a - 2 commits from branch master
• 59111f8f - build: LTO profile 'thin' and moved to Cargo.toml

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enabled an automatic merge when the pipeline for 59111f8f succeeds

merged