Fix binary search goroutine to avoid deadlocks

airflow/container_runtime.go

@@ -6,10 +6,9 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/astronomer/astro-cli/pkg/util"
-
 	"github.com/astronomer/astro-cli/config"
 	"github.com/astronomer/astro-cli/pkg/fileutil"
+	"github.com/astronomer/astro-cli/pkg/util"
 	"github.com/pkg/errors"
 )
 
@@ -56,7 +55,15 @@ func FindBinary(pathEnv, binaryName string, checker FileChecker) bool {
 			defer wg.Done()
 			binaryPath := filepath.Join(dir, binaryName)
 			if exists := checker.Exists(binaryPath); exists {
-				found <- binaryPath
+				select {
+				// If the channel is open, send the path in, indicating a found binary.
+				case found <- binaryPath:
+				// If another goroutine has already sent a path into the channel
+				// we'd be blocked. The default clause will run instead and effectively
+				// skip sending the path into the channel, doing nothing, but allowing the
+				// goroutine to complete without blocking.
+				default:
+				}
 			}
 		}(dir)
 	}