fix: clone also the main branch

Closes coop-cloud/go-abra#65.

pkg/recipe/recipe.go

@@ -70,7 +70,15 @@ func EnsureExists(recipe string) error {
 		url := fmt.Sprintf("%s/%s.git", config.REPOS_BASE_URL, recipe)
 		_, err := git.PlainClone(recipeDir, false, &git.CloneOptions{URL: url, Tags: git.AllTags})
 		if err != nil {
-			return err
+			// try with main branch because Git is being a Git
+			_, err := git.PlainClone(recipeDir, false, &git.CloneOptions{
+				URL:           url,
+				Tags:          git.AllTags,
+				ReferenceName: plumbing.ReferenceName("refs/heads/main"),
+			})
+			if err != nil {
+				return err
+			}
 		}
 	}