ci(mobile): build labelled PR previews with the release profile

.github/workflows/mobile-eas-preview.yml

@@ -75,9 +75,14 @@ jobs:
         env:
           EXPO_TOKEN: ${{ secrets.EXPO_TOKEN }}
         with:
-          profile: preview:dev
+          # Release configuration, not `preview:dev`: PR builds must show
+          # production-grade performance and memory behaviour. The dev-client
+          # `preview:dev` profile stays available for local Metro attachment.
+          profile: preview
           branch: pr-${{ github.event.pull_request.number }}
-          platform: all
+          # iOS only: Android has no signing keystore configured, so including
+          # it fails the job before the iOS artifact is published.
+          platform: ios
           environment: preview
           working-directory: apps/mobile
           github-token: ${{ secrets.GITHUB_TOKEN }}

apps/mobile/README.md

@@ -122,7 +122,7 @@ The native lint task runs SwiftLint for Swift plus ktlint and detekt for Kotlin.
 
 ## EAS Builds
 
-CI uses Expo fingerprinting with the `preview:dev` profile to reuse an existing compatible build when possible, or start a new internal EAS build when native runtime inputs change. Production and default local builds continue to use the `appVersion` runtime policy.
+CI uses Expo fingerprinting with the `preview` profile to reuse an existing compatible build when possible, or start a new internal EAS build when native runtime inputs change. That profile builds the release configuration, so labelled PR builds behave like production for performance and memory; use `preview:dev` when you want a dev client on the preview channel that attaches to local Metro. Production and default local builds continue to use the `appVersion` runtime policy.
 
 For preview or production EAS environments, set `T3CODE_CLERK_PUBLISHABLE_KEY`,
 `T3CODE_CLERK_JWT_TEMPLATE`, and `T3CODE_RELAY_URL`

apps/mobile/eas.json

@@ -20,11 +20,15 @@
       "corepack": true,
       "env": {
         "APP_VARIANT": "preview",
+        "MOBILE_VERSION_POLICY": "fingerprint",
         "NODE_OPTIONS": "--max-old-space-size=4096"
       },
       "channel": "preview",
       "environment": "preview",
-      "distribution": "internal"
+      "distribution": "internal",
+      "android": {
+        "buildType": "apk"
+      }
     },
     "preview:dev": {
       "corepack": true,