ci: set explicit 'event' filters an all 'when'-statements

This should fix the CI warnings we've started to see lately:

    [bad_habit] Please set an event filter on all when branches

.woodpecker.yaml

@@ -3,9 +3,9 @@
 steps:
   - name: codespell
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     image: alpine:edge
     commands:
       - apk add openssl
@@ -19,9 +19,9 @@ steps:
 
   - name: subprojects
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     image: alpine:edge
     commands:
       - apk add git
@@ -32,9 +32,9 @@ steps:
 
   - name: x64
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     depends_on: [subprojects]
     image: alpine:edge
     commands:
@@ -89,9 +89,9 @@ steps:
 
   - name: x86
     when:
-      branch:
-        - master
-        - releases/*
+      - event: [manual, pull_request]
+      - event: [push, tag]
+        branch: [master, releases/*]
     depends_on: [subprojects]
     image: i386/alpine:edge
     commands: