Remove obsolete files and add kernel metapackage build scripts

- Deleted the Mozilla Public License file as it is no longer needed.
- Removed unused MOTD and Debian vendor information files.
- Added new scripts for building a kernel metapackage and detecting kernel packages.
- Removed legacy shell configuration files and associated MD5 sums.
- Cleaned up unnecessary documentation and policy files related to /usr/local permissions.

Jenkinsfile

@@ -1,98 +1,122 @@
 pipeline {
     agent any
 
+    options {
+        skipDefaultCheckout(true)
+        disableConcurrentBuilds()
+        timestamps()
+    }
+
     environment {
-        PACKAGE_NAME = "base-files"
-        APTLY_REPO = "espos-unstable"
-
-        APTLY_HOST = "ubuntu@elordenador.org"
-
-        DEB_FILE = "*.deb"
+        KERNEL_JOB = 'espos-kernel'
+        APTLY_REPO = 'espos-unstable'
+        APTLY_HOST = 'ubuntu@elordenador.org'
+        APTLY_SSH_HOST = 'elordenador.org'
     }
 
     stages {
-        
         stage('Checkout') {
             steps {
+                deleteDir()
                 checkout scm
             }
         }
 
-        stage('Install Build Dependencies') {
+        stage('Download kernel artifacts') {
+            steps {
+                // Copy Artifact plugin: latest successful build of espos-kernel.
+                copyArtifacts(
+                    projectName: env.KERNEL_JOB,
+                    selector: lastSuccessful(stable: false),
+                    filter: '**/linux-image-*-espos_*.deb,**/linux-headers-*-espos_*.deb',
+                    target: 'kernel-artifacts',
+                    flatten: true,
+                    optional: false
+                )
+                sh 'find kernel-artifacts -maxdepth 1 -type f -name "*.deb" -print'
+            }
+        }
+
+        stage('Install build dependencies') {
             steps {
                 sh '''
-                sudo apt update
-                sudo apt install -y build-essential devscripts debhelper lintian
+                    set -eu
+                    sudo apt-get update
+                    sudo apt-get install -y dpkg-dev lintian
                 '''
             }
         }
 
-        stage("Build Debian Package") {
+        stage('Build metapackage') {
             steps {
                 sh '''
-                dpkg-buildpackage -us -uc 
-                ls -lah ..
+                    set -eu
+                    ./scripts/build-metapackage kernel-artifacts dist
+                    dpkg-deb --info dist/espos-kernel_*.deb
                 '''
             }
         }
 
-        stage("Lintian Check") {
+        stage('Lintian') {
             steps {
-                sh '''
-                lintian ../*.deb || true
-                '''
+                sh 'lintian dist/espos-kernel_*.deb'
             }
         }
-        stage("Upload to aptly") {
+
+        stage('Publish in Aptly') {
             steps {
                 sshagent(['srv01_elordenador_org']) {
-                    sh '''
-                    ssh-keyscan -H elordenador.org >> ~/.ssh/known_hosts
-                    scp ../${DEB_FILE} ${APTLY_HOST}:/tmp/
-                    '''
-                }
-            }
-        }
-        stage("Publish Repository") {
-            steps {
-                sshagent(['srv01_elordenador_org']) {
-                
                     withCredentials([
-                        string(
-                            credentialsId: 'aptly_gpg_pass',
-                            variable: 'GPG_PASS'
-                        )
+                        string(credentialsId: 'aptly_gpg_pass', variable: 'GPG_PASS')
                     ]) {
-                    
                         sh '''
-                        ssh ${APTLY_HOST} "
-                            aptly repo add espos-unstable /tmp/*.deb
-        
-                            if aptly publish list | grep -q espos-unstable
-                            then
-                                aptly publish update \
-                                    -passphrase='${GPG_PASS}' \
-                                    espos-unstable
-                            else
-                                aptly publish repo \
-                                    -distribution=espos-unstable \
-                                    -component=main \
-                                    -passphrase='${GPG_PASS}' \
-                                    espos-unstable
-                            fi
-                        "
+                            set -eu
+
+                            remote_dir="/tmp/espos-kernel-metapackage-${BUILD_TAG}"
+                            mkdir -p "$HOME/.ssh"
+                            chmod 700 "$HOME/.ssh"
+                            ssh-keyscan -H "$APTLY_SSH_HOST" >> "$HOME/.ssh/known_hosts"
+
+                            ssh "$APTLY_HOST" "mkdir -p '$remote_dir' && chmod 700 '$remote_dir'"
+                            trap 'ssh "$APTLY_HOST" "rm -rf '\''$remote_dir'\''"' EXIT HUP INT TERM
+                            scp dist/espos-kernel_*.deb "$APTLY_HOST:$remote_dir/"
+
+                            # The passphrase travels over SSH stdin and is never an argument.
+                            printf '%s' "$GPG_PASS" | ssh "$APTLY_HOST" \
+                                "umask 077; cat > '$remote_dir/gpg-passphrase'"
+
+                            ssh "$APTLY_HOST" "
+                                set -eu
+                                aptly repo add -force-replace '$APTLY_REPO' '$remote_dir'/espos-kernel_*.deb
+
+                                if aptly publish list -raw | grep -Eq '^[^[:space:]]+[[:space:]]+$APTLY_REPO$'; then
+                                    aptly publish update \
+                                        -passphrase-file='$remote_dir/gpg-passphrase' \
+                                        '$APTLY_REPO'
+                                else
+                                    aptly publish repo \
+                                        -distribution='$APTLY_REPO' \
+                                        -component=main \
+                                        -passphrase-file='$remote_dir/gpg-passphrase' \
+                                        '$APTLY_REPO'
+                                fi
+                            "
                         '''
                     }
                 }
             }
-        }  
+        }
     }
+
     post {
+        always {
+            archiveArtifacts artifacts: 'dist/espos-kernel_*.deb', fingerprint: true, allowEmptyArchive: true
+        }
         success {
-            echo "Paquete publicado correctamente"
+            echo 'Metapaquete espos-kernel publicado correctamente'
         }
         failure {
-            echo "Error construyendo paquete"
+            echo 'Error construyendo o publicando espos-kernel'
         }
     }
-}
+}