Remove composer / npm / yarn shared cache (#99)

* Update Jenkinsfile
* remove shared folder

Author: Sébastien GLON

.ci/Jenkinsfile

@@ -433,12 +433,10 @@ def withBuildNode(String phpVersion, body) {
                 command: 'cat',
                 alwaysPullImage: true,
                 envVars: [
-                    envVar(key: "COMPOSER_HOME", value: "/shared/.composer"),
                     envVar(key: "COMPOSER_AUTH", value: "{\"github-oauth\":{\"github.com\": \"$token\"}}")],
                 resourceRequestCpu: '500m',
                 resourceRequestMemory: '1000Mi')
         ], volumes: [
-            nfsVolume(mountPath: '/shared', serverAddress: "${env.NFS_IP}", serverPath: '/exports', readOnly: false),
             hostPathVolume(hostPath: "/var/run/docker.sock", mountPath: "/var/run/docker.sock")
         ]) {
             node("build-" + uuid) {