ci: use lockable resources to limit e2e build to one per host

Referenced issue:
* status-im/infra-ci#86

Author: markoburcul

ci/Jenkinsfile.tests-e2e.windows

@@ -168,26 +168,29 @@ pipeline {
       steps {
         timeout(time: getTestStageTimeout()) {
           dir('test/e2e') {
-            script {
-              def flags = []
-              if (params.TEST_NAME)       { flags.add("-k=${params.TEST_NAME}") }
-              if (params.TEST_SCOPE_FLAG) { flags.add(params.TEST_SCOPE_FLAG) }
-              if (params.LOG_LEVEL)       { flags.addAll(["--log-level=${params.LOG_LEVEL}", "--log-cli-level=${params.LOG_LEVEL}"]) }
-              def flagStr = flags.join(' ')
-
-              withCredentials([
-                usernamePassword(credentialsId: 'test-rail-api-devops', usernameVariable: 'TESTRAIL_USR', passwordVariable: 'TESTRAIL_PSW'),
-                string(credentialsId: 'wallet-test-user-seed', variable: 'WALLET_TEST_USER_SEED')
-              ]) {
-                sh"""
-                  pushd configs
-                  ln -sf _local.ci.py _local.py || cp _local.ci.py _local.py
-                  popd
-
-                """
-                bat"""
-                  python310 -m pytest -m "not keycard" -v --reruns=1 --timeout=300 ${flagStr} --disable-warnings --alluredir=./allure-results -o timeout_func_only=true
-                """
+            /* Lock the agent so we run only one e2e build at a time */
+            lock(resource: "e2e-windows-${env.NODE_NAME}", quantity: 1) {
+              script {
+                def flags = []
+                if (params.TEST_NAME)       { flags.add("-k=${params.TEST_NAME}") }
+                if (params.TEST_SCOPE_FLAG) { flags.add(params.TEST_SCOPE_FLAG) }
+                if (params.LOG_LEVEL)       { flags.addAll(["--log-level=${params.LOG_LEVEL}", "--log-cli-level=${params.LOG_LEVEL}"]) }
+                def flagStr = flags.join(' ')
+
+                withCredentials([
+                  usernamePassword(credentialsId: 'test-rail-api-devops', usernameVariable: 'TESTRAIL_USR', passwordVariable: 'TESTRAIL_PSW'),
+                  string(credentialsId: 'wallet-test-user-seed', variable: 'WALLET_TEST_USER_SEED')
+                ]) {
+                  sh"""
+                    pushd configs
+                    ln -sf _local.ci.py _local.py || cp _local.ci.py _local.py
+                    popd
+
+                  """
+                  bat"""
+                    python310 -m pytest -m "not keycard" -v --reruns=1 --timeout=300 ${flagStr} --disable-warnings --alluredir=./allure-results -o timeout_func_only=true
+                  """
+                }
               }
             }
           }