Update deploy-ftp.sh

Adding retry logic for creatin the tar ball to ensure what we upload is valid.

build/deploy-ftp.sh

@@ -19,7 +19,28 @@ echo "password $FTP_SECRET" >> "$NETRC"
 chmod 600 "$NETRC"
 
 upload_file(){
-    (cd out; tar czf $EMULATOR.tgz $EMULATOR)
+    MAX_RETRIES=5
+    RETRY_COUNT=0
+
+    while (( RETRY_COUNT < MAX_RETRIES )); do
+        (cd out; tar czf $EMULATOR.tgz $EMULATOR)
+
+        # Verify the tarball
+        if tar tf $EMULATOR.tgz >/dev/null 2>&1; then
+            echo "Tarball is valid and can be expanded."
+            break
+        else
+            echo "Tarball is not valid or cannot be expanded. Retrying..."
+            RETRY_COUNT=$((RETRY_COUNT + 1))
+            rm -f $EMULATOR.tgz
+            continue
+        fi
+    done
+
+    if (( RETRY_COUNT == MAX_RETRIES )); then
+        echo "Failed to create a valid tarball after $MAX_RETRIES attempts."
+        return 1
+    fi
 
     echo "Deploying as $USER at $HOST"
 
@@ -33,6 +54,7 @@ bye
 EOF
 }
 
+
 test_archive_integrity(){
     echo "Testing download of $EMULATOR.tgz"
     mkdir -p "$TESTDIR"