Fix jobs copying, Add nodeJS v12

jenkins/Dockerfile

@@ -31,7 +31,7 @@ RUN /usr/local/bin/install-plugins.sh < /usr/share/jenkins/ref/plugins.txt
 COPY groovy/* /usr/share/jenkins/ref/init.groovy.d/
 
 # Adds job configurations for apella
-COPY jobs/* /var/jenkins_home/jobs/
+COPY jobs/. /var/jenkins_home/jobs/
 
 # Sets defaults
 # Gets rid of admin password setup

jenkins/groovy/nodejs.groovy

@@ -6,10 +6,11 @@ import jenkins.plugins.nodejs.tools.NodeJSInstaller
 import static jenkins.plugins.nodejs.tools.NodeJSInstaller.DEFAULT_NPM_PACKAGES_REFRESH_HOURS
 
 final versions = [
-        'NodeJS 13.x': '13.10.1'
+        'NodeJS 13.x': '13.10.1',
+        'NodeJS 12.x': '12.16.1'
 ]
 
-final globalPackages = "eslint@~6.8.0"
+final globalPackages = "eslint@~6.8.0 truffle@~5.1.18"
 
 Jenkins.instance.getDescriptor(NodeJSInstallation).with {
     installations = versions.collect {