ci: fixed some steps running when not required

.woodpecker/.build.yml

@@ -12,7 +12,7 @@ pipeline:
     commands:
       - make
     when:
-      event: [push, pull_request]
+      event: [pull_request]
       branch:
         exclude: [main]
 

.woodpecker/.lint.yml

@@ -10,4 +10,4 @@ pipeline:
     commands:
       - make lint
     when:
-      event: [ push, pull_request ]
+      event: [ pull_request ]

.woodpecker/.test.yml

@@ -14,4 +14,4 @@ pipeline:
     commands:
       - make test
     when:
-      event: [push, pull_request]
+      event: [pull_request]