remove Jenkins caching (#3594)

Jenkinsfile

@@ -20,9 +20,6 @@ def runStages(nodeDir) {
 				sh "git submodule update --init --recursive"
 			}
 
-			cache(maxCacheSize: 250, caches: [
-				[$class: "ArbitraryFileCache", excludes: "", includes: "**/*", path: "${WORKSPACE}/${nodeDir}/jsonTestsCache"]
-			]) {
 			stage("Preparations") {
 				sh """#!/bin/bash
 				set -e
@@ -30,10 +27,9 @@ def runStages(nodeDir) {
 				make clean
 				# to allow the following parallel stages
 				make -j${env.NPROC} QUICK_AND_DIRTY_COMPILER=1 update
-					./scripts/setup_scenarios.sh jsonTestsCache
+				./scripts/setup_scenarios.sh
 				"""
 			}
-			}
 
 			stage("Tools") {
 				sh """#!/bin/bash