ci: add key.properties creation, limit gradle memory

.gitea/workflows/release.yml

@@ -8,6 +8,8 @@ on:
 jobs:
   build:
     runs-on: self-hosted
+    env:
+      GRADLE_OPTS: "-Xmx3g -Dorg.gradle.daemon=false -Dorg.gradle.parallel=false"
     steps:
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -39,6 +41,15 @@ jobs:
         env:
           KEYSTORE_BASE64: ${{ secrets.KEYSTORE_BASE64 }}
 
+      - name: Create key.properties
+        run: |
+          cat > android/key.properties <<EOF
+          storePassword=Store_sc4l3
+          keyPassword=Store_sc4l3
+          keyAlias=siab
+          storeFile=../siab-release.keystore
+          EOF
+
       - name: Build App Bundle
         run: |
           flutter build appbundle \