create signing android app files

.github/workflows/main.yml

@@ -12,13 +12,31 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v2
 
-    - name: Write secrets.properties
+    - name: Create secrets.properties
       shell: bash
       env: 
         MAPS_API_KEY: ${{ secrets.MAPS_API_KEY }}
       run: |
-        echo "MAPS_API_KEY=$MAPS_API_KEY" >> android/secrets.properties
-      
+        echo "MAPS_API_KEY=$MAPS_API_KEY" > android/secrets.properties
+
+    - name: Create upload keystore
+      shell: bash
+      env: 
+        KEY_STORE: ${{ secrets.KEY_STORE }}
+      run: |
+        echo "$KEY_STORE" | base64 -d > android/upload-keystore.jks
+
+    - name: Create key.properties
+      shell: bash
+      env: 
+        STORE_PASSWORD: ${{ secrets.STORE_PASSWORD }}
+        KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
+      run: |
+        echo "storePassword=$STORE_PASSWORD" > android/key.properties
+        echo "keyPassword==$KEY_PASSWORD" >> android/key.properties
+        echo "keyAlias=upload" >> android/key.properties
+        echo "storeFile=upload-keystore.jks" >> android/key.properties
+  
     - name: Set up Flutter
       uses: subosito/flutter-action@v2