ci: quote server provision bash heredocs

jenkins/Jenkinsfile.production-server-provision

@@ -77,7 +77,7 @@ pipeline {
           userRemoteConfigs: [[url: "${GIT_REMOTE_URL}"]],
         ])
         sh '''
-          bash -lc '
+          bash <<'BASH'
             set -euo pipefail
             chmod +x scripts/jenkins-checkout-source.sh
             SOURCE_BRANCH="${SOURCE_BRANCH:-master}" \
@@ -85,7 +85,7 @@ pipeline {
             GIT_REMOTE_URL="${GIT_REMOTE_URL}" \
             SOURCE_COMMIT_FILE=".jenkins-source-commit" \
             scripts/jenkins-checkout-source.sh
-          '
+BASH
         '''
       }
     }
@@ -96,7 +96,7 @@ pipeline {
       }
       steps {
         sh '''
-          bash -lc '
+          bash <<'BASH'
             set -euo pipefail
 
             require_path() {
@@ -624,7 +624,7 @@ pipeline {
             fi
 
             echo "[server-provision] 完成。若是首次初始化，请补齐 ${API_ENV_FILE} 的真实密钥后再启动 api-server。"
-          '
+BASH
         '''
       }
     }