Docker Hub has this lovely feature where *they* provide builds of Dockerfiles. For example: https://hub.docker.com/r/etsy/hound/
This is great for making software more trustworthy. I can review the code on GitHub and be confident that I'm running the same code. More platforms should do this.
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Over a sufficiently long time horizon, all code you write is legacy code.
I'm intrigued to see that Google has quantified that new code is generally buggier and less secure than code that has existed in your codebase for longer: https://security.googleblog.com/2024/09/eliminating-memory-safety-vulnerabilities-Android.html
It's really satisfying to use a profiler for the first time on a project. I always find a big performance win with only a small code change.
It's never the code that I expected to be slow, however!