bzip2 is needed on Ubuntu

Author: dimpase

.github/workflows/main.yml

@@ -119,7 +119,7 @@ jobs:
 
 env:
     # Ubuntu packages to install so that the project's "setup.py sdist" can succeed
-    DIST_PREREQ: libpari-dev pari-doc
+    DIST_PREREQ: libpari-dev pari-doc libbz2-dev bzip2
     # Name of this project in the Sage distribution
     SPKG:        cypari
     # Remove all downstream patches