Update drone config

.drone.yml

@@ -1,17 +1,23 @@
 kind: pipeline
 name: default
 
-
 steps:
-- name: build
+  - name: preview
     image: rust:1.50-slim
     commands:
-  - cargo build
+    - env
+    - pwd
+    - ls
+    - ls -a /
+# - name: build
+#   image: rust:1.50-slim
+#   commands:
+#   - cargo build
 
-- name: test
-  image: rust:1.50-slim
-  commands:
-  - cargo test
+# - name: test
+#   image: rust:1.50-slim
+#   commands:
+#   - cargo test
 
 # kind: pipeline
 # type: exec