Create GRADLE_USER_HOME if it doesn't exist before symlinking caches

os.Symlink fails with "no such file or directory" when the parent
directory of the link target doesn't exist. Add MkdirAll so the
restore command works on machines where ~/.gradle has never been created.

Author: joshfriend

cmd/gradle-cache/main.go

@@ -274,6 +274,9 @@ func (c *RestoreCmd) Run(ctx context.Context) error {
 		return errors.Errorf("extracted bundle does not contain a caches/ directory: %w", err)
 	}
 	localCaches := filepath.Join(c.GradleUserHome, "caches")
+	if err := os.MkdirAll(c.GradleUserHome, 0o750); err != nil {
+		return errors.Wrap(err, "create gradle user home dir")
+	}
 	if err := os.RemoveAll(localCaches); err != nil {
 		return errors.Wrap(err, "remove existing caches dir")
 	}