ci: prod -> production, add optional fmt test

.drone.yml

@@ -7,6 +7,11 @@ steps:
   commands:
   - cargo build --verbose --all
   - cargo test --verbose --all
+- name: test_fmt
+  image: rust:1.77.2-slim
+  commands:
+  - cargo fmt -- --check
+  failure: ignore
 - name: deploy
   image: rust:1.77.2-slim
   commands:
@@ -16,6 +21,10 @@ steps:
       include: [ promote ]
     target:
       include: [ staging ]
+  depends_on:
+    - test
+    - test_fmt
+
 - name: deploy_prod
   image: rust:1.77.2-slim
   commands:
@@ -24,4 +33,7 @@ steps:
     event:
       include: [ promote ]
     target:
-      include: [ prod ]
+      include: [ production ]
+  depends_on:
+    - test
+    - test_fmt