fix(ci): skip on Gitea + add contents:write for release creation

- Add job condition `github.server_url == 'https://github.com'` so Gitea
  (no runner) ignores the workflow entirely
- Add `permissions: contents: write` required by softprops/action-gh-release

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -7,8 +7,11 @@ on:
 
 jobs:
   build:
+    if: github.server_url == 'https://github.com'
     runs-on: ubuntu-latest
-    timeout-minutes: 30
+    timeout-minutes: 60
+    permissions:
+      contents: write
 
     steps:
       - uses: actions/checkout@v4
@@ -27,22 +30,52 @@ jobs:
         with:
           version: 9
 
+      - name: Get pnpm store path
+        id: pnpm-cache
+        shell: bash
+        run: echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_OUTPUT
+
+      - name: Cache pnpm store
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-
+
       - name: Install dependencies
         working-directory: artifacts/postiz-mobile
         run: pnpm install --no-frozen-lockfile
 
-      - name: Install Expo CLI
-        run: pnpm add -g expo-cli@latest || true
-
       - name: Set up Android SDK
         uses: android-actions/setup-android@v3
 
       - name: Accept Android SDK licenses
         run: yes | sdkmanager --licenses || true
 
+      - name: Cache Android NDK
+        id: ndk-cache
+        uses: actions/cache@v4
+        with:
+          path: /usr/local/lib/android/sdk/ndk/28.2.13676358
+          key: ndk-28.2.13676358-v1
+
       - name: Install SDK components
         run: |
-          sdkmanager "platform-tools" "platforms;android-35" "build-tools;35.0.0" "ndk;28.2.13676358"
+          sdkmanager "platform-tools" "platforms;android-35" "build-tools;35.0.0"
+          if [ "${{ steps.ndk-cache.outputs.cache-hit }}" != "true" ]; then
+            sdkmanager "ndk;28.2.13676358"
+          fi
+
+      - name: Cache Gradle
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('artifacts/postiz-mobile/package.json') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
 
       - name: Decode keystore
         run: |