Fix tag matching

Jenkinsfile

@@ -3,12 +3,10 @@ pipeline {
 
   triggers {
     GenericTrigger(
-      causeString: 'Triggered on tag push',
+      causeString: 'Triggered by push event',
       token: 'tag-trigger-secret',
       printContributedVariables: true,
       printPostContent: true,
-      regexpFilterExpression: 'ref=refs/tags/.*\nafter=(?!0{40}).*',
-      regexpFilterText: '$ref\n$after',
       genericVariables: [
         [key: 'ref', value: '$.ref'],
         [key: 'after', value: '$.after']
@@ -23,22 +21,30 @@ pipeline {
   }
 
   stages {
-    stage('Tag Check') {
+    stage('Tag Push Filter') {
       steps {
         script {
-          def isTag = sh(script: 'git describe --tags --exact-match || echo "nope"', returnStdout: true).trim()
-          if (isTag == "nope") {
-            echo "Not a tag. Skipping build."
+          if (!env.ref?.startsWith('refs/tags/')) {
+            echo "Not a tag push (ref = ${env.ref}). Skipping build."
             currentBuild.result = 'NOT_BUILT'
             return
           }
+
+          if (env.after == null || env.after ==~ /^0{40}$/) {
+            echo "After SHA is null or zeroed (after = ${env.after}). Skipping build."
+            currentBuild.result = 'NOT_BUILT'
+            return
+          }
+
+          echo "Valid tag push detected: ${env.ref} (${env.after})"
         }
       }
     }
+
     stage('Build & Push Docker Image') {
       when {
         expression {
-          return env.GIT_COMMIT && env.GIT_COMMIT != ""
+          return env.ref?.startsWith('refs/tags/') && env.GIT_COMMIT && env.GIT_COMMIT != ""
         }
       }
       steps {