Add clang-format dockerfile to this repo.

Add --rebuild-docker flag in trigger

Author: rbg2004

dockerfile/clang-format.dockerfile

@@ -0,0 +1,15 @@
+# MEGA clang-format Linter
+# mega-docker.artifactory.developers.mega.co.nz:8443/clang-format-desktop:latest
+
+FROM ubuntu:22.04
+
+ENV DEBCONF_NOWARNINGS=yes
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && \
+    apt-get install -y git clang-format && \
+    useradd clang-format -d /var/lib/clang-format -m -s /bin/bash
+
+USER clang-format
+
+WORKDIR /var/lib/clang-format

jenkinsfile/MR_status/Jenkinsfile_MR_clang_format

@@ -1,8 +1,11 @@
+def REBUILD_IMAGE = false
+
 pipeline {
     agent none
     options {
         buildDiscarder(logRotator(numToKeepStr: '135', daysToKeepStr: '21'))
         gitLabConnection('GitLabConnectionJenkins')
+        ansiColor('xterm')
     }
     stages {
         stage('Update Gitlab commit status') {
@@ -27,10 +30,45 @@ pipeline {
                         ])
                     }
                 }
+                stage('Get parameters'){
+                    steps {
+                        script{
+                            // flag may be `--rebuild-docker` or empty ``
+                            def flag = sh(script: 'echo "$gitlabTriggerPhrase" | grep -o "\\-\\-rebuild-docker\\$" || :', returnStdout: true).trim()
+                            REBUILD_IMAGE = flag == "--rebuild-docker"
+                            echo "REBUILD_IMAGE set to ${REBUILD_IMAGE}"
+                        }
+                    }
+                }
+                stage('Rebuild docker image') {
+                    when {
+                        beforeAgent true
+                        expression { REBUILD_IMAGE }
+                    }
+                    steps {
+                        dir ("dockerfile") {
+                            sh """
+                                docker build \
+                                    -f clang-format.dockerfile \
+                                    -t mega-docker.artifactory.developers.mega.co.nz:8443/clang-format-desktop:latest \
+                                    .
+                            """
+                        }
+                        withCredentials([usernamePassword(credentialsId: 'artifactory-jenkins-docker', usernameVariable: 'ART_USER', passwordVariable: 'ART_PASS')]) {
+                            sh """
+                                echo \$ART_PASS | docker login \
+                                                    -u \$ART_USER \
+                                                    --password-stdin \
+                                                    mega-docker.artifactory.developers.mega.co.nz:8443
+                                docker push mega-docker.artifactory.developers.mega.co.nz:8443/clang-format-desktop:latest
+                            """
+                        }
+                    }
+                }
                 stage('Clang format'){
                     agent {
                         docker {
-                            image 'mega-docker.artifactory.developers.mega.co.nz:8443/clang-format:latest'
+                            image 'mega-docker.artifactory.developers.mega.co.nz:8443/clang-format-desktop:latest'
                             reuseNode true
                         }
                     }