Add Linting and tests to Jenkins pipeline

Jenkinsfile

@@ -1,6 +1,6 @@
 #!groovy
 /*
-Copyright 2017-2021 Jan Dittberner
+Copyright 2017-2022 Jan Dittberner
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this program except in compliance with the License.
@@ -21,13 +21,37 @@ pipeline {
         go "go-1.18"
     }
 
+    environment {
+        GOPATH = "${env.WORKSPACE_TMP}/go"
+    }
+
     stages {
-        stage('Build') {
+        stage('Lint') {
+            when { not { branch 'debian' } }
             steps {
-                sh "make distclean && make"
+                script {
+                    if (!fileExists("${env.GOPATH}/bin/golangci-lint")) {
+                        sh label: 'Install golangci-lint', script: 'mkdir -p "$(go env GOPATH)"; curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin'
+                    }
+                }
+                sh label: 'Show environment', script: 'go env GOPATH'
+                sh label: 'Run golangci-lint', script: '$(go env GOPATH)/bin/golangci-lint run --sort-results --verbose --max-same-issues 0 --max-issues-per-linter 0'
+            }
+        }
+        stage('Build') {
+            when { not { branch 'debian' } }
+            steps {
+                sh label: 'Build binary', script: 'make distclean && make'
+            }
+        }
+        stage('Test') {
+            when { not { branch 'debian' } }
+            steps {
+                sh label: 'Run tests', script: 'go test -v ./...'
             }
         }
         stage('Create build output') {
+            when { not { branch 'debian' } }
             steps {
                 archiveArtifacts artifacts: 'cacert-boardvoting,config.yaml.example'
             }