!fixup! add missing backslash in ci.yml

- should fix RPM installation in Linux x64 build

Author: dougbu

.azure/pipelines/ci.yml

@@ -273,7 +273,7 @@ stages:
             -p:BuildRuntimeArchive=false \
             -p:LinuxInstallerType=rpm \
             -bl:artifacts/log/build.rpm.binlog \
-            $(_BuildArgs)
+            $(_BuildArgs) \
             $(_PublishArgs)
         displayName: Build RPM installers
       installNodeJs: false