feat: allow for setup.sh based user fixtures

internal/miro/testhelpers_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"miro/internal/testutil"
@@ -78,3 +79,14 @@ func containsEnvEntry(env []string, want string) bool {
 
 	return false
 }
+
+func containsEnvKey(env []string, key string) bool {
+	prefix := key + "="
+	for _, entry := range env {
+		if strings.HasPrefix(entry, prefix) {
+			return true
+		}
+	}
+
+	return false
+}