DROP BEFORE MERGE check env on entry to Install PETSc step

Author: dsroberts

.github/workflows/core.yml

@@ -543,6 +543,7 @@ jobs:
 
       - name: Install PETSc
         run: |
+          env
           if [ ${{ inputs.target_branch }} = 'release' ]; then
             git clone --depth 1 \
               --branch $(python3 ./firedrake-repo/scripts/firedrake-configure --gpu-arch cuda --show-petsc-version) \