chore: Add release-lite profile for low-RAM environments

[jbencin]

Description

Add release-lite profile, which should build faster and take less RAM

Applicable issues

• fixes Large amount of memory (~16GB) required to build next branch code #4584

Additional info (benefits, drawbacks, caveats)

Also fixes the code blocks in the README. The $ characters at beginning of each line were unnecessary and interfered with syntax highlighting and copy/pasting

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.75%. Comparing base (2686009) to head (cf4fab4).
Report is 5 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #4599      +/-   ##
==========================================
- Coverage   83.46%   77.75%   -5.71%     
==========================================
  Files         470      470              
  Lines      332151   332151              
  Branches      317      317              
==========================================
- Hits       277220   258256   -18964     
- Misses      54923    73887   +18964     
  Partials        8        8              

see 173 files with indirect coverage changes

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[wileyj]

hmm, i still hit high memory usage here (14GB at max, running with --release hit around 16GB):
command used:

cargo build --features monitoring_prom,slog_json --profile release-lite

this was on a 64GB system though, i'm going to try on a low memory VM and see if can OOM

[wileyj]

running on a VM with 8Gb of memory, the usage maxed out at 6.13GB used.
as predicted, this did extend the compile time by a little, but it seemed acceptable.

nice work @jbencin !

[wileyj]

Some README updates requested since there are changes being made there, but otherwsie looks good!

[wileyj]

ping @moodmosaic

[wileyj]

@obycode if you're so inclined, i'd be interested if this profile works on your armv7 pi

[obycode]

@obycode if you're so inclined, i'd be interested if this profile works on your armv7 pi

Sure. To clarify, you want me to try this build on the pi, right?

[obycode]

I still hit a problem on there.

LLVM ERROR: out of memory
Allocation failed
error: could not compile `stackslib` (lib)

I wouldn't make this platform a blocker though.

[wileyj]

I still hit a problem on there.

LLVM ERROR: out of memory
Allocation failed
error: could not compile `stackslib` (lib)

I wouldn't make this platform a blocker though.

good data to have, thanks for checking. agreed this shouldn't be a blocker. buy new hardware @obycode lol

[moodmosaic]

FWIW, I tested this on both Ubuntu ARM and Ubuntu x64 on 8GB VMs and worked like a charm. 👍