ci: Optimize artifact sizes to fix 413 Request Entity Too Large error

- Reduce Linux build artifacts to only essential files (citron binary + AppImage)
- Remove build/bin/ and build/dist/ directories from artifacts (too large)
- Optimize cache to only store vcpkg and dependency files
- Remove .git/modules/ from cache to reduce size
- Remove Android .so files from artifacts, keep only APK
- This should fix the GitLab artifact upload size limit issue"

Signed-off-by: Zephyron <zephyron@citron-emu.org>

.gitlab-ci.yml

@@ -13,8 +13,8 @@ variables:
 # Cache configuration for faster builds
 cache:
   paths:
-    - build/
-    - .git/modules/
+    - build/vcpkg_installed/
+    - build/_deps/
   key: "$CI_COMMIT_REF_SLUG"
   policy: pull-push
 
@@ -93,9 +93,8 @@ build-linux:
     - ./AppImage-build-local.sh || echo "AppImage build failed, continuing..."
   artifacts:
     paths:
-      - build/bin/
+      - build/bin/citron
       - citron.AppImage
-      - build/dist/
     expire_in: 1 week
     when: always
   only:
@@ -163,7 +162,6 @@ build-android:
   artifacts:
     paths:
       - src/android/app/build/outputs/apk/mainline/release/*.apk
-      - build-android/bin/*.so
     expire_in: 1 week
   only:
     - main