Add TEST_STRING to GitHub Actions workflow

Added TEST_STRING environment variable for decoding.

Author: acffordyce973

.github/workflows/github-actions.yml

@@ -26,8 +26,10 @@ jobs:
         env:
           ENCODED_STRING: ${{ secrets.KEYSTORE_KEY_BASE64 }}
           SIGNING_KEY_STORE_PATH: ${{ secrets.KEYSTORE_KEY_PATH }}
+          TEST_STRING: ${{ secrets.TEST_SECRET }}
 
         run: |
+          echo $TEST_STRING
           echo $ENCODED_STRING > keystore-b64.txt
           base64 -d keystore-b64.txt > $SIGNING_KEY_STORE_PATH