ci: parallelize xcframework slice builds

[armcknight]

The job to build the xcframework builds all the slices in serial, which takes upwards of 30 minutes. There are at least 6 slices, so if we parallelize these, we should be able to cut that time down to a small fraction.

Before: 30 minutes 52 seconds
After: 6 minutes 17 seconds

One thing I noticed but haven't yet addressed is that the SentrySwiftUI build actually produced Sentry.xcframework as well, because to archive the SentrySwiftUI target, Sentry target must be built as well as it's a dependency. So, we could avoid the duplicated tests with some tweaks to the workflow logic. I just haven't figured out how to do that yet.

Another future task could be caching individual slices and assembled variants, as not all will always need to be rebuilt (think, if uikit code is modified, then the UIKitless variant won't need to be rebuilt).

#skip-changelog

Fixes GH-4925

[philipphofmann]

That would be super nice to get done. Thanks for starting this @armcknight.

[armcknight]

Got the slices all building in parallel, working on downloading the artifacts for assembly together. It's looking like the total job time will be around 5-6 minutes now based on https://github.com/getsentry/sentry-cocoa/actions/runs/15080146739

[armcknight]

Fiiiiinally got all the things in the right path locations to get it all passing again. Final result: 6m17s.

[armcknight]

The only CI checks I validated were in the workflow build-xcframework.yml. The failing tests are due to having removed the old build-xcframework.sh script but not yet updating benchmarking.yml or ui-tests.yml to use the new reusable workflows that parallelize the steps from it; #5277 fixes that and should be merged into this branch before merging this one to main.

[armcknight]

done and removed in #5277

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1207.55 ms	1228.81 ms	21.26 ms
Size	23.76 KiB	824.89 KiB	801.13 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
bfe863d	1223.19 ms	1236.23 ms	13.04 ms
d33f2c8	1233.67 ms	1246.92 ms	13.24 ms
ebfe678	1234.63 ms	1254.52 ms	19.89 ms
06548c0	1226.71 ms	1252.37 ms	25.66 ms
216bdf9	1193.69 ms	1217.90 ms	24.21 ms
154f795	1225.53 ms	1231.04 ms	5.51 ms
2095ae0	1238.20 ms	1251.37 ms	13.17 ms
27f970b	1234.21 ms	1243.98 ms	9.77 ms
bdd896e	1211.19 ms	1239.06 ms	27.87 ms
0589699	1233.49 ms	1249.09 ms	15.60 ms

App size

Revision	Plain	With Sentry	Diff
bfe863d	21.58 KiB	414.57 KiB	392.99 KiB
d33f2c8	22.31 KiB	820.52 KiB	798.20 KiB
ebfe678	22.31 KiB	775.27 KiB	752.95 KiB
06548c0	20.76 KiB	427.36 KiB	406.59 KiB
216bdf9	21.58 KiB	418.13 KiB	396.54 KiB
154f795	20.76 KiB	435.25 KiB	414.49 KiB
2095ae0	21.90 KiB	709.06 KiB	687.16 KiB
27f970b	21.58 KiB	706.97 KiB	685.39 KiB
bdd896e	22.31 KiB	780.75 KiB	758.43 KiB
0589699	21.58 KiB	656.60 KiB	635.02 KiB

Previous results on branch: armcknight/ci/parallelize-xcframework-build

Startup times

Revision	Plain	With Sentry	Diff
cd452df	1229.82 ms	1254.49 ms	24.67 ms
abb8f1a	1232.08 ms	1245.48 ms	13.40 ms

App size

Revision	Plain	With Sentry	Diff
cd452df	23.76 KiB	824.89 KiB	801.13 KiB
abb8f1a	23.76 KiB	824.89 KiB	801.13 KiB

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.899%. Comparing base (25e00aa) to head (ab6cd13).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #5218       +/-   ##
=============================================
- Coverage   92.900%   92.899%   -0.002%     
=============================================
  Files          688       688               
  Lines        86303     86299        -4     
  Branches     31201     31192        -9     
=============================================
- Hits         80176     80171        -5     
- Misses        6025      6028        +3     
+ Partials       102       100        -2     

see 9 files with indirect coverage changes

---

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