Use triggers instead of step conditions in .drone.yml where relevant

.drone.yml

@@ -7,10 +7,6 @@ steps:
     pull: always
     commands:
       - cargo test --all --all-features
-    when:
-      event:
-        - push
-        - pull_request
 
   - name: auto-release
     image: xena/gitea-release
@@ -26,6 +22,10 @@ steps:
         - push
       branch:
         - main
+trigger:
+  event:
+    - push
+    - pull_request
 
 ---
 
@@ -40,6 +40,6 @@ steps:
     environment:
       CARGO_TOKEN:
         from_secret: CARGO_TOKEN
-    when:
+trigger:
-      event:
+  event:
-        - tag
+    - tag