diff --git a/.woodpecker.yml b/.woodpecker.yml
new file mode 100644
index 0000000..11f3669
--- /dev/null
+++ b/.woodpecker.yml
@@ -0,0 +1,15 @@
+when:
+  - event: [push, pull_request, manual]
+
+steps:
+  - name: verify-fixture
+    image: alpine:3.20@sha256:d9e853e87e55526f6b2917df91a2115c36dd7c696a35be12163d44e6e2a4b6bc
+    commands:
+      - set -eu
+      - test -s README.md
+      - test -s fixture.md
+      - test -s .woodpecker.yml
+      - grep -Fqx '# prmerge-trailer-fixture' README.md
+      - grep -Fq 'RETAINED AS EVIDENCE' README.md
+      - grep -Fqx '# PR merge trailer fixture' fixture.md
+      - test "$$(find . -maxdepth 1 -type f -name '*.md' -size +0c | wc -l)" -ge 2