ci: don't run metrics on forks

[vaind]

Trying out if this could be a solution to only run metrics on pushes to the repo instead of on forks. Currently, I suspect it may fail because some GHA context var won't be set to an expected value if it's not on a PR.

See also #1073 (comment)

[codecov-commenter]

Codecov Report

Base: 89.97% // Head: 89.97% // No change to project coverage 👍

Coverage data is based on head (55d7053) compared to base (5d15a51).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1075   +/-   ##
=======================================
  Coverage   89.97%   89.97%           
=======================================
  Files         115      115           
  Lines        3582     3582           
=======================================
  Hits         3223     3223           
  Misses        359      359           

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[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	344.04 ms	384.84 ms	40.80 ms
Size	5.94 MiB	6.92 MiB	1003.76 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
9c5aec6	287.33 ms	320.94 ms	33.61 ms
559d28f	302.35 ms	339.53 ms	37.18 ms
56810ff	309.72 ms	352.26 ms	42.54 ms
3e5ee37	317.56 ms	366.84 ms	49.28 ms
6d317ea	303.46 ms	356.06 ms	52.60 ms
72dfc83	298.62 ms	340.14 ms	41.52 ms
49a149b	301.96 ms	344.51 ms	42.55 ms
1c6eb5b	350.69 ms	393.86 ms	43.17 ms
af2d175	279.08 ms	312.37 ms	33.29 ms
633cf2e	289.36 ms	340.38 ms	51.02 ms

App size

Revision	Plain	With Sentry	Diff
9c5aec6	5.94 MiB	6.92 MiB	1001.61 KiB
559d28f	5.94 MiB	6.92 MiB	1001.70 KiB
56810ff	5.94 MiB	6.92 MiB	1001.71 KiB
3e5ee37	5.94 MiB	6.92 MiB	1001.19 KiB
6d317ea	5.94 MiB	6.92 MiB	1001.74 KiB
72dfc83	5.94 MiB	6.92 MiB	1001.71 KiB
49a149b	5.94 MiB	6.92 MiB	1001.54 KiB
1c6eb5b	5.94 MiB	6.92 MiB	1001.53 KiB
af2d175	5.94 MiB	6.92 MiB	1001.83 KiB
633cf2e	5.94 MiB	6.92 MiB	1001.53 KiB

Previous results on branch: ci/metrics-no-forks

Startup times

Revision	Plain	With Sentry	Diff
b4e2a98	334.40 ms	417.92 ms	83.52 ms

App size

Revision	Plain	With Sentry	Diff
b4e2a98	5.94 MiB	6.92 MiB	1001.71 KiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1270.76 ms	1293.39 ms	22.64 ms
Size	8.15 MiB	9.12 MiB	991.36 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
af2d175	1280.37 ms	1282.24 ms	1.88 ms
633cf2e	1257.96 ms	1275.73 ms	17.77 ms
49a149b	1296.47 ms	1320.20 ms	23.73 ms
56810ff	1267.59 ms	1293.48 ms	25.89 ms
559d28f	1265.04 ms	1288.96 ms	23.92 ms
3e5ee37	1248.25 ms	1265.38 ms	17.13 ms
9c5aec6	1266.51 ms	1274.65 ms	8.14 ms
72dfc83	1262.50 ms	1289.75 ms	27.25 ms
1c6eb5b	1277.85 ms	1285.71 ms	7.86 ms
6d317ea	1277.27 ms	1287.47 ms	10.20 ms

App size

Revision	Plain	With Sentry	Diff
af2d175	8.15 MiB	9.12 MiB	986.22 KiB
633cf2e	8.15 MiB	9.12 MiB	986.26 KiB
49a149b	8.15 MiB	9.12 MiB	986.26 KiB
56810ff	8.15 MiB	9.12 MiB	987.35 KiB
559d28f	8.15 MiB	9.12 MiB	987.32 KiB
3e5ee37	8.15 MiB	9.12 MiB	986.23 KiB
9c5aec6	8.15 MiB	9.12 MiB	986.23 KiB
72dfc83	8.15 MiB	9.12 MiB	987.30 KiB
1c6eb5b	8.15 MiB	9.12 MiB	986.27 KiB
6d317ea	8.15 MiB	9.12 MiB	986.26 KiB

Previous results on branch: ci/metrics-no-forks

Startup times

Revision	Plain	With Sentry	Diff
b4e2a98	1267.43 ms	1279.10 ms	11.68 ms

App size

Revision	Plain	With Sentry	Diff
b4e2a98	8.15 MiB	9.12 MiB	987.34 KiB