Use dev-env as base container (#141)

Author: schnellerhase

.github/workflows/test_mpc.yml

@@ -14,7 +14,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    container: ghcr.io/fenics/dolfinx/dolfinx:nightly
+    container: ghcr.io/fenics/dolfinx/dev-env:current-mpich
 
     strategy:
       matrix: