ci: add job testing the key decoding

Author: NorbertKlockiewicz

.github/workflows/test-keystore.yml

@@ -0,0 +1,45 @@
+name: Test Keystore
+
+on:
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: "temurin"
+          java-version: "17"
+
+      - name: Decode and verify keystore
+        run: |
+          echo "Decoding keystore..."
+          echo '${{ secrets.ANDROID_KEYSTORE_BASE64 }}' | base64 --decode > test.keystore
+
+          if [ -f test.keystore ]; then
+            echo "✓ Keystore file created"
+            echo "File size: $(wc -c < test.keystore) bytes"
+          else
+            echo "✗ Failed to create keystore file"
+            exit 1
+          fi
+
+          echo "Verifying keystore with keytool..."
+          keytool -list -keystore test.keystore -storepass '${{ secrets.ANDROID_KEYSTORE_PASSWORD }}'
+
+          if [ $? -eq 0 ]; then
+            echo "✓ Keystore is valid!"
+          else
+            echo "✗ Keystore verification failed"
+            exit 1
+          fi
+
+      - name: Clean up
+        if: always()
+        run: rm -f test.keystore