Fix CI workflow

Author: Wavesonics

.github/workflows/build.yml

@@ -23,6 +23,12 @@ jobs:
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
 
+      - name: Decode Keystore
+        env:
+          ENCODED_KEYSTORE: ${{ secrets.ENCODED_KEYSTORE }}
+        run: |
+          echo $ENCODED_KEYSTORE | base64 -d > app/keystore.jks
+
       - name: Build with Gradle
         run: ./gradlew build