[v9.3.x] Docker Build: Use tonistiigi/binfmt image for cross compilation (#64116)

Docker Build: Use `tonistiigi/binfmt` image for cross compilation (#64108)

* Change docker image used for cross-compilation

* Replace fmt.Println with log.Println

* Add specific tag for docker image

(cherry picked from commit b42fd92fad)

Co-authored-by: Dimitris Sotirakis <dimitrios.sotirakis@grafana.com>

pkg/build/docker/init.go

@@ -10,6 +10,9 @@ import (
 // AllArchs is a list of all supported Docker image architectures.
 var AllArchs = []string{"amd64", "armv7", "arm64"}
 
+// emulatorImage is the docker image used as the cross-platform emulator
+var emulatorImage = "tonistiigi/binfmt:qemu-v7.0.0"
+
 // Init initializes the OS for Docker image building.
 func Init() error {
 	// Necessary for cross-platform builds
@@ -18,11 +21,14 @@ func Init() error {
 	}
 
 	// Enable execution of Docker images for other architectures
+	//nolint:gosec
 	cmd := exec.Command("docker", "run", "--privileged", "--rm",
-		"docker/binfmt:a7996909642ee92942dcd6cff44b9b95f08dad64")
+		emulatorImage, "--install", "all")
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		return fmt.Errorf("failed to enable execution of cross-platform Docker images: %w\n%s", err, output)
 	}
+	log.Println("emulators have been installed successfully!")
+
 	return nil
 }