test: use volumes in Woodpecker CI

.woodpecker.yml

@@ -8,3 +8,26 @@ pipeline:
       - make setup-code
       - (cd client/ && yarn generate)
       - make -C server build
+    when:
+      branch: none
+
+  step1:
+    image: alpine:latest
+    commands:
+      - date
+      - ls -l /mnt/
+      - date >/mnt/step1.txt
+      - ls -l /mnt/
+    volumes: 
+      - /mnt:/mnt
+
+  step2:
+    image: alpine:latest
+    commands:
+      - date
+      - ls -l /mnt/
+      - date >/mnt/step2.txt
+      - ls -l /mnt/
+    volumes: 
+      - /mnt:/mnt
+