Create the batsee output directory if one doesn't exist yet.

Also adding the output directory to .gitignore.

.gitignore

@@ -14,3 +14,4 @@ SysbenchDockerfile
 SysbenchDockerfile.dockerignore
 sysbench-runner-tests-entrypoint.sh
 config.json
+integration-tests/bats/batsee_results

go/utils/batsee/main.go

@@ -313,6 +313,17 @@ func runBats(path string, resultChan chan<- batsResult, ctx context.Context, cfg
 		return
 	}
 
+	// ensure cfg.output exists, and create it if it doesn't
+	if _, err := os.Stat(cfg.output); os.IsNotExist(err) {
+		err = os.Mkdir(cfg.output, 0755)
+		if err != nil {
+			cli.Println("Error creating output directory:", err.Error())
+			result.err = err
+			resultChan <- result
+			return
+		}
+	}
+
 	startTime := time.Now()
 
 	outPath := fmt.Sprintf("%s/%s.stdout.log", cfg.output, path)