Update tests-pypi.yml

Author: beckermr

.github/workflows/tests-pypi.yml

@@ -54,6 +54,7 @@ jobs:
       - name: install bzip2 and other tools on linux
         if: contains(matrix.os, 'ubuntu')
         run: |
+          sudo apt-get update
           sudo apt-get install libbz2-dev wget make curl libcurl4-openssl-dev
 
       - name: build fitsio