ci: Begin CI pipeline

ci/Dockerfile

@@ -9,6 +9,7 @@ RUN dnf install -y \
     gcc \
     make \
     ncurses-devel \
+    openssh-clients \
     patch \
     perl-ExtUtils-MakeMaker \
     perl-FindBin \

ci/Jenkinsfile

@@ -14,6 +14,12 @@ pipeline {
         pollSCM ''
     }
 
+    parameters {
+        booleanParam \
+            name: 'Clean',
+            description: 'Clean the workspace and perform a full rebuild'
+    }
+
     environment {
         BUILDROOT_SRC = "${env.WORKSPACE}/buildroot"
     }
@@ -21,6 +27,11 @@ pipeline {
     stages {
         stage('Prepare') {
             steps {
+                script {
+                    if (params.Clean) {
+                        sh 'rm -rf _build'
+                    }
+                }
                 checkout poll: false, scm: [
                     $class: 'GitSCM',
                     branches: [[name: '2022.02.x']],