CI: slim Flutter SDK for gating jobs; APK only on app changes, Gradle cached

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.github/workflows/pre-commit.yml

@@ -57,12 +57,11 @@ jobs:
       # The flutter-analyze hook shells out to `flutter analyze` in
       # stronglift_replacement/workout_app. Pin to the version the app is
       # developed against (Dart SDK ^3.12.2) so CI's analyzer matches local.
-      - uses: subosito/flutter-action@v2
+      - uses: kuhyx/utils/flutter-setup@flutter-setup-v1
         if: matrix.group == 'flutter'
         with:
           flutter-version: 3.47.6
-          channel: stable
-          cache: true
+          working-directory: stronglift_replacement/workout_app
       # analyze needs resolved packages (.dart_tool); the hook runs analyze
       # only, so fetch deps here first.
       - name: Resolve Flutter packages

.github/workflows/python-tests.yml

@@ -92,13 +92,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      # cache: true keeps the SDK and ~/.pub-cache between runs; without it
-      # the SDK download alone was ~57 s.
-      - uses: subosito/flutter-action@v2
+      # The slim cached SDK (utils/flutter-setup): subosito's full-SDK
+      # cache cost ~38 s to restore even on a hit.
+      - uses: kuhyx/utils/flutter-setup@flutter-setup-v1
         with:
           flutter-version: 3.47.6
-          channel: stable
-          cache: true
+          working-directory: stronglift_replacement/workout_app
 
       - name: flutter test --coverage, bucket ${{ matrix.shard }}
         run: bash scripts/check_flutter_coverage.sh --shard "${{ matrix.shard }}/$FLUTTER_SHARDS"

.github/workflows/release-apk.yml

@@ -3,6 +3,14 @@ name: release-apk
 on:
   push:
     branches: [main]
+    # A publisher, not a gate: build only when something that ends up in
+    # the APK changed. versionCode is the commit count, so skipped pushes
+    # still leave it monotonic.
+    paths:
+      - 'stronglift_replacement/workout_app/**'
+      - '.fvmrc'
+      - '.versioncode-offset'
+      - '.github/workflows/release-apk.yml'
   # Lets a release be rebuilt from the current main without a dummy commit.
   workflow_dispatch:
 
@@ -47,6 +55,8 @@ jobs:
         with:
           distribution: temurin
           java-version: "17"
+          # ~/.gradle caches + wrapper, keyed on the Gradle files.
+          cache: gradle
 
       - uses: subosito/flutter-action@v2
         with: