[wip] add sysimage size to make output report

[IanButterworth]

This seems the wrong way to report size because the file isn't finished being written to Now calculates the size later

Generating REPL precompile statements... 40/40
Executing precompile statements... 1828/1871
Precompilation complete. Summary:
Generation ── 106.718929 seconds 75.3884%
Execution ───  34.839853 seconds 24.6116%
Total ─────── 141.558782 seconds
Outputting sysimage file...
Output ────── 146.560538 seconds, sysimage size: 153.216 MiB
    LINK usr/lib/julia/sys.dylib

[vchuravy]

Probably better to just add it to sysimg.mk

[IanButterworth]

Any idea why this works locally but not on CI? Seems julia can't find the default sysimage at that point?

[vtjnash]

At some point (on buildbot) we used to run a make build-stats step in CI, which printed this info as well as a variety of other related data-points. Not sure what happened to that step lately

[IanButterworth]

huh.. ok, yeah that already does what this was trying to do.

JuliaCI/julia-buildkite#224