misc: Always clean images

Author: JDBetteridge

.github/workflows/pytest-core-mpi.yaml

@@ -83,6 +83,7 @@ jobs:
           arch: icx
           os: ubuntu-latest
           # Need safe math for icx due to inaccuracy with mpi+sinc interpolation
+          # (Only on acoustic)
           mpiflag: "-e DEVITO_SAFE_MATH=1"
 
     steps:
@@ -131,6 +132,7 @@ jobs:
         command: "mpiexec -n 2 pytest examples/seismic/tti"
 
     - name: Cleanup docker image
+      if: always()
       uses: ./.github/actions/docker-clean
       with:
         id: ${{ steps.build.outputs.unique }}