ci: add some ci stages (promote)

.drone.yml

@@ -3,7 +3,25 @@ name: default
 
 steps:
 - name: test
-  image: rust:latest
+  image: rust:1.77.2-slim
   commands:
   - cargo build --verbose --all
   - cargo test --verbose --all
+- name: deploy
+  image: rust:1.77.2-slim
+  commands:
+    - echo "deploying staging..."
+  when:
+    event:
+      include: [ promote ]
+    target:
+      include: [ staging ]
+- name: deploy_prod
+  image: rust:1.77.2-slim
+  commands:
+    - echo "deploying production..."
+  when:
+    event:
+      include: [ promote ]
+    target:
+      include: [ prod ]