Try.

.woodpecker/build.yaml

@@ -14,15 +14,15 @@ steps:
 - name: prepare
   image: alpine
   commands:
-    - sleep 10000
     # Because we run the next step as user 1000 to make podman work:
-    - chown -R 1000:1000 .
-    - chown -R 1000:1000 $HOME
+    - mkdir /woodpecker/workflow
+    - chown 1000:1000 /woodpecker/workflow
+    - chown -R 1000:1000 $CI_WORKSPACE
 
 - name: build-jars
   image: registry.mnl.de/mnl/jdk21-builder:v3
   environment:
-    HOME: /root
+    HOME: /woodpecker/workflow
     REGISTRY: registry.mnl.de
     REGISTRY_USER: mnl
     REGISTRY_TOKEN: