ci: Add Jenkins build/publish pipeline

ci/Jenkinsfile

@@ -0,0 +1,40 @@
+// vim: set sw=4 ts=4 sts=4 et :
+
+pipeline {
+    agent {
+        kubernetes {
+            yamlFile 'ci/podTemplate.yaml'
+            defaultContainer 'build'
+        }
+    }
+
+    stages {
+        stage('Build') {
+            steps {
+                sh 'make rpm'
+            }
+        }
+
+        stage('Publish') {
+            when {
+                branch 'main'
+            }
+            steps {
+                withCredentials([usernamePassword(
+                    credentialsId: 'jenkins-packages',
+                    usernameVariable: 'GITEA_USERNAME',
+                    passwordVariable: 'GITEA_PASSWORD',
+                )]) {
+                    sh 'make publish'
+                }
+            }
+        }
+    }
+
+    post {
+        success {
+            archiveArtifacts '*.rpm'
+        }
+    }
+
+}