Update serve-ximera.yml: add calculus2

Author: wiobber

.github/workflows/serve-ximera.yml

@@ -5,7 +5,7 @@ on:
 
 env: 
   XM_COMPILE_SEQUENCE: html
-  XM_TO_PROCESS: "testxourse.tex calculus1.tex"
+  XM_TO_PROCESS: "testxourse.tex calculus1.tex calculus2.tex"
   # XM_TO_PROCESS: "."
 
 jobs: