chore: add Gemfile for metrics and lockfile for iOS

[philprime]

While refreshing the Apple code signing certificates and profiles I noticed that fastlane is set up at /metrics/fastlane but there is not /metrics/Gemfile, while there is one for /flutter/example/ios/Gemfile implicating the usage of bundle exec fastlane ....

AFAIK the Gemfile.lock should also be checked into version control, because you want to ensure that everyone is using the exact same versions of tooling. As I am not an active maintainer for sentry-dart I'll leave the decision to you if you want them checked in.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.16%. Comparing base (48a9615) to head (a7f4c63).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2885      +/-   ##
==========================================
+ Coverage   87.63%   89.16%   +1.53%     
==========================================
  Files         272       93     -179     
  Lines        9032     3065    -5967     
==========================================
- Hits         7915     2733    -5182     
+ Misses       1117      332     -785     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1265.73 ms	1278.30 ms	12.56 ms
Size	8.43 MiB	10.01 MiB	1.58 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
891efac	1233.78 ms	1248.31 ms	14.53 ms
7659cbe	1246.70 ms	1265.88 ms	19.17 ms
7359546	1252.02 ms	1271.55 ms	19.53 ms
202b83f	1206.16 ms	1225.33 ms	19.16 ms
211a7aa	1258.02 ms	1275.65 ms	17.63 ms
613760b	1263.10 ms	1277.27 ms	14.16 ms
5e8d2b3	1255.71 ms	1267.98 ms	12.27 ms
280ab9f	1255.71 ms	1262.78 ms	7.06 ms
73d70bf	1249.08 ms	1268.41 ms	19.33 ms
6034b0a	1244.89 ms	1270.22 ms	25.33 ms

App size

Revision	Plain	With Sentry	Diff
891efac	8.28 MiB	9.34 MiB	1.06 MiB
7659cbe	8.42 MiB	9.89 MiB	1.47 MiB
7359546	8.42 MiB	9.83 MiB	1.40 MiB
202b83f	8.33 MiB	9.40 MiB	1.07 MiB
211a7aa	8.10 MiB	9.18 MiB	1.08 MiB
613760b	8.15 MiB	9.13 MiB	1000.46 KiB
5e8d2b3	8.29 MiB	9.36 MiB	1.07 MiB
280ab9f	8.29 MiB	9.39 MiB	1.10 MiB
73d70bf	8.38 MiB	9.70 MiB	1.33 MiB
6034b0a	8.33 MiB	9.40 MiB	1.07 MiB

[buenaflor]

thanks!

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	496.31 ms	538.78 ms	42.47 ms
Size	6.44 MiB	7.43 MiB	1010.50 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
3adbea9	395.16 ms	447.88 ms	52.71 ms
8c0b6dc	454.21 ms	512.22 ms	58.01 ms
f25f207	341.40 ms	427.73 ms	86.34 ms
aed5947	295.70 ms	348.18 ms	52.48 ms
213fb39	509.17 ms	557.36 ms	48.20 ms
21845e2	345.08 ms	382.82 ms	37.74 ms
2b9937e	439.68 ms	478.38 ms	38.70 ms
d61cecf	339.69 ms	387.57 ms	47.88 ms
6d7a391	331.94 ms	367.04 ms	35.10 ms
6edf8b8	486.35 ms	547.52 ms	61.17 ms

App size

Revision	Plain	With Sentry	Diff
3adbea9	6.52 MiB	7.61 MiB	1.09 MiB
8c0b6dc	6.49 MiB	7.56 MiB	1.07 MiB
f25f207	6.33 MiB	7.26 MiB	943.41 KiB
aed5947	5.94 MiB	6.96 MiB	1.02 MiB
213fb39	6.44 MiB	7.43 MiB	1010.28 KiB
21845e2	5.94 MiB	6.92 MiB	1003.77 KiB
2b9937e	6.49 MiB	7.56 MiB	1.07 MiB
d61cecf	6.06 MiB	7.03 MiB	995.56 KiB
6d7a391	5.94 MiB	6.95 MiB	1.01 MiB
6edf8b8	6.44 MiB	7.43 MiB	1010.28 KiB