ci(folio): give the ios leg its jdk, android sdk, just, and a clean app start

.github/workflows/folio.yml

@@ -94,7 +94,6 @@ jobs:
           api-level: 34
           target: google_apis
           arch: x86_64
-          profile: pixel_6
           emulator-options: -no-window -gpu swiftshader_indirect -no-snapshot -noaudio -no-boot-anim
           disable-animations: true
           script: .github/scripts/folio-run.sh android
@@ -128,8 +127,20 @@ jobs:
         with:
           bun-version: "1.3.13"
 
-      - name: Install idb-companion and xcodegen
-        run: brew install idb-companion xcodegen
+      - name: Install idb-companion, xcodegen and just
+        run: brew install idb-companion xcodegen just
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "17"
+
+      # The iOS app builds its Kotlin framework through the folio gradle
+      # project, which configures :app:androidApp and so needs an Android SDK
+      # even on this leg.
+      - name: Set up Android SDK
+        uses: android-actions/setup-android@v3
 
       # Both asset tarballs are built by the prepare scripts, and the runner
       # bundle is an xcodebuild of companion/Sources. Keyed on the scripts and
@@ -158,6 +169,12 @@ jobs:
         env:
           IOS_DEVICE: iPhone 16 Pro
 
+      # `just ios` leaves the app running, and the run's own clear-data
+      # reinstall on top of a live app has raced FrontBoard into refusing the
+      # launch ("app.folio is unknown to FrontBoard") with the run then hanging.
+      - name: Stop the app before the run
+        run: xcrun simctl terminate booted app.folio || true
+
       - name: Fuzz folio on the simulator
         run: .github/scripts/folio-run.sh ios
         env: