CI: actually check for successful sync

.github/workflows/test-sync.yml

@@ -33,6 +33,7 @@ jobs:
         cd build
         mkdir data
         ./p2pool --host p2pmd.xmrvsbeast.com --zmq-port 18084 --wallet 44MnN1f3Eto8DZYUWuE5XZNUtE3vcRzt2j6PzqWpPau34e6Cf4fAxt6X2MBmrm6F9YMEiMNjN6W4Shn4pLcfNAja621jwyg --no-cache --data-api data --local-api --loglevel 6
+        grep 'Synchronization finished successfully' p2pool.log
 
     - name: Archive p2pool.log
       uses: actions/upload-artifact@v3
@@ -69,6 +70,7 @@ jobs:
         cd build
         mkdir data
         ./p2pool --host p2pmd.xmrvsbeast.com --zmq-port 18084 --wallet 44MnN1f3Eto8DZYUWuE5XZNUtE3vcRzt2j6PzqWpPau34e6Cf4fAxt6X2MBmrm6F9YMEiMNjN6W4Shn4pLcfNAja621jwyg --no-cache --data-api data --local-api --loglevel 6
+        grep 'Synchronization finished successfully' p2pool.log
 
     - name: Archive p2pool.log
       uses: actions/upload-artifact@v3
@@ -105,6 +107,7 @@ jobs:
         cd build/Debug
         mkdir data
         ./p2pool.exe --host p2pmd.xmrvsbeast.com --zmq-port 18084 --wallet 44MnN1f3Eto8DZYUWuE5XZNUtE3vcRzt2j6PzqWpPau34e6Cf4fAxt6X2MBmrm6F9YMEiMNjN6W4Shn4pLcfNAja621jwyg --no-cache --data-api data --local-api --loglevel 6
+        findstr /C:"Synchronization finished successfully" p2pool.log
 
     - name: Archive p2pool.log
       uses: actions/upload-artifact@v3