ci: fix build by adding pod install and pipefail

[kinyoklion]

Summary

The CI build was silently failing for two reasons:

1. Missing pod install: When the vendored Pods/ directory was removed (commit 9a0eedb), a pod install step was never added to CI. The xcworkspace references Pods/Pods.xcodeproj which doesn't exist without it.

2. Missing pipefail: Piping xcodebuild to xcpretty without set -o pipefail meant the pipeline exit code came from xcpretty (always 0), masking the build failure.

Fixes both issues so CI correctly installs dependencies and reports failures.

Link to Devin session: https://app.devin.ai/sessions/5b1fe090ca3247c9a9e594a426c3a8ef
Requested by: @kinyoklion

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