Remove Jenkinsfile from debian branch

This commit removes the Jenkinsfile from the debian branch to avoid
building code from this branch.

Jenkinsfile

@@ -1,44 +0,0 @@
-#!groovy
-/*
-   Copyright 2017-2019 Jan Dittberner
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this program except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-pipeline {
-    agent any
-
-    environment {
-        GOPATH = "${pwd(tmp: true)}/gocode"
-        PATH = "${GOPATH}/bin:${PATH}"
-    }
-
-    stages {
-        stage('Install go-bindata') {
-            steps {
-                sh "mkdir -p '${GOPATH}/bin'"
-                sh "cd '${GOPATH}/bin'"
-                sh "go get -u -v github.com/shuLhan/go-bindata/cmd/go-bindata"
-            }
-        }
-        stage('Build') {
-            steps {
-                sh "make distclean && make BUILD='${env.BUILD_TAG}'"
-            }
-        }
-        stage('Create build output') {
-            steps {
-                archiveArtifacts artifacts: 'cacert-boardvoting,config.yaml.example'
-            }
-        }
-    }
-}