Please note that the environment section is not able to expand environment variables

.woodpecker/main.yml

@@ -13,6 +13,5 @@ steps:
       - ./gradlew publish --no-daemon
     environment: 
       - LOCAL_MAVEN=/var/www/maven
-      - BUILD_NUMBER=$CI_PIPELINE_NUMBER
     volumes:
       - /var/www/maven:/var/www/maven

build.gradle

@@ -9,8 +9,8 @@ plugins {
 jarJar.enable()
 
 version = mod_version
-if (System.getenv('BUILD_NUMBER') != null) {
-    version += "." + System.getenv('BUILD_NUMBER')
+if (System.getenv('CI_PIPELINE_NUMBER') != null) {
+    version += "." + System.getenv('CI_PIPELINE_NUMBER')
 }
 
 group = mod_group_id