Fix archive path

glue/main.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"os"
 	"os/exec"
+	"path"
 	"strings"
 	"time"
 
@@ -220,8 +221,10 @@ func (p *Processor) volumeFromURL(url string, container *docker.Container) error
 	}
 
 	// Download the archive
+	archivePath := path.Join(volumePath, "archive.tar.zst")
+
 	log.Printf("%s: downloading archive from %s\n", container.App.Name, url)
-	f, err := os.Create(volumePath + "/archive.tar.zst")
+	f, err := os.Create(archivePath)
 	if err != nil {
 		return fmt.Errorf("failed to create archive file: %v", err)
 	}
@@ -243,7 +246,7 @@ func (p *Processor) volumeFromURL(url string, container *docker.Container) error
 	log.Printf("%s: extracting archive\n", container.App.Name)
 
 	// Call tar xf archive.tar.zst -C /volume
-	cmd := exec.Command("tar", "-xf", "archive.tar.zst", "-C", volumePath)
+	cmd := exec.Command("tar", "-xf", archivePath, "-C", volumePath)
 	err = cmd.Run()
 	if err != nil {
 		log.Printf("%s: failed to extract archive: %v", container.App.Name, err)