test: run clean-again between tests, not at the end

So that we free up space for the next run, as we are seeing disk space
issues on Ubuntu CI due to the many images built and left around

test/run-integration-tests.sh

@@ -118,14 +118,12 @@ if [[ ${#ARGS[@]} -ne 0 ]]; then
         RESULTS["$test"]="$result"
         TIMES["$test"]="$SECONDS"
 
-        [[ "$result" -ne 0 ]] && FAILURES=$((FAILURES + 1))
-    done
-fi
-
-# Run clean-again, if requested, and if no tests failed
-if [[ $FAILURES -eq 0 && $CLEAN_AGAIN -eq 1 ]]; then
-    for test in "${!RESULTS[@]}"; do
-        test_run "$test" make -C "$test" clean-again
+        # Run clean-again here to free up space, if requested, and if the test succeeded
+        if [[ "$result" -ne 0 ]]; then
+            FAILURES=$((FAILURES + 1))
+        elif [[ $CLEAN_AGAIN -eq 1 ]]; then
+            test_run "$test" make -C "$test" clean-again
+        fi
     done
 fi