Completely disable GitLab CI cache to fix disk space issues

- Remove all cache configuration (cache section deleted)
- Remove GRADLE_USER_HOME and PUB_CACHE variables
- Disable Gradle parallel builds (parallel=false for stability)
- Remove cache cleanup scripts (no longer needed)
- Remove 'clean' task (no cache to clean)

Build will be slower but guaranteed to work without disk space errors.
Fresh build every time - no cache artifacts taking up space.

.gitlab-ci.yml

@@ -4,31 +4,17 @@ stages:
   - deploy
 
 variables:
-  GRADLE_OPTS: "-Dorg.gradle.daemon=false -Dorg.gradle.jvmargs='-Xmx2048m' -Dorg.gradle.parallel=true"
+  GRADLE_OPTS: "-Dorg.gradle.daemon=false -Dorg.gradle.jvmargs='-Xmx2048m' -Dorg.gradle.parallel=false"
-  GRADLE_USER_HOME: "${CI_PROJECT_DIR}/.gradle"
-  PUB_CACHE: "${CI_PROJECT_DIR}/.pub-cache"
-
-cache:
-  key: ${CI_COMMIT_REF_SLUG}
-  paths:
-    - .gradle/wrapper
-    - .gradle/caches/modules-2
-    - .pub-cache/
-  policy: pull-push
 
 build:torrent-engine:
   stage: build
   image: mingc/android-build-box:latest
   before_script:
     - echo "sdk.dir=${ANDROID_SDK_ROOT:-/opt/android-sdk}" > android/local.properties
-    # Clean up old Gradle cache to free space
-    - rm -rf .gradle/caches/transforms-*
-    - rm -rf .gradle/caches/*/transforms
-    - find .gradle/caches -name "*.lock" -type f -delete || true
   script:
     - cd android
     - chmod +x gradlew
-    - ./gradlew clean :torrentengine:assembleRelease --no-daemon --stacktrace
+    - ./gradlew :torrentengine:assembleRelease --no-daemon --stacktrace
   artifacts:
     paths:
       - android/torrentengine/build/outputs/aar/*.aar