simplify workflows

.github/workflows/code-format.yml

@@ -1,35 +0,0 @@
-name: Check code formatting
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
-
-jobs:
-  spotless:
-    name: Check Java formatting (Spotless)
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-java@v5
-        with:
-          java-version: 17
-          distribution: temurin
-      - uses: actions/cache@v4
-        with:
-          path: |
-            ~/.gradle/caches
-            ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
-          restore-keys: |
-            ${{ runner.os }}-gradle-
-      - name: Validate Gradle Wrapper
-        uses: gradle/actions/wrapper-validation@v4
-      - name: Check formatting
-        run: ./gradlew spotlessCheck

.github/workflows/preview-apk.yml

@@ -14,14 +14,12 @@ jobs:
       - uses: actions/checkout@v5
         with:
           submodules: recursive
-      - uses: Swatinem/rust-cache@v2
-        with:
-          working-directory: jni/deltachat-core-rust
+
       - uses: actions/setup-java@v5
         with:
           java-version: 17
           distribution: 'temurin'
-      - uses: android-actions/setup-android@v3
+
       - uses: actions/cache@v4
         with:
           path: |
@@ -30,13 +28,22 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
+
+      - name: Validate Gradle Wrapper
+        uses: gradle/actions/wrapper-validation@v4
+
+      - name: Check code format
+        run: ./gradlew spotlessCheck
+
+      - uses: android-actions/setup-android@v3
       - uses: nttld/setup-ndk@v1
         id: setup-ndk
         with:
           ndk-version: r27
 
-      - name: Validate Gradle Wrapper
-        uses: gradle/actions/wrapper-validation@v4
+      - uses: Swatinem/rust-cache@v2
+        with:
+          working-directory: jni/deltachat-core-rust
 
       - name: Compile core
         env: