updates jenkins to publish nuget to gitea

Jenkinsfile

@@ -10,9 +10,15 @@ pipeline {
   }
 
   stages {
-    stage('cleaning workspace') {
+    stage('preparing workspace') {
       steps {
-        sh "rm -rf ${env.WORKSPACE}/publish"
+        cleanWs deleteDirs: true, notFailBuild: true, patterns: [[pattern: '.nuget/NuGet/NuGet.Config', type: 'INCLUDE']]
+        dir('publish') {
+          deleteDir()
+        }
+        withCredentials([usernamePassword(credentialsId: 'giteaNugetPushCreds', passwordVariable: 'NUGETPWD', usernameVariable: 'NUGETUSR')]) {
+          sh 'dotnet nuget add source --name gitea --username $NUGETUSR --password $NUGETPWD --store-password-in-clear-text https://git.haefelfinger.net/api/packages/piwigo/nuget/index.json'
+        }
       }
     }
 
@@ -34,6 +40,12 @@ pipeline {
       }
     }
 
+    stage('nuget publish') {
+      steps {
+        sh "dotnet nuget push --source gitea ${env.WORKSPACE}/publish/*.nupkg"
+      }
+    }
+
   }
 
   post {