v1.1.1: patch image caching for odd entrypoints

This patches how the new image cache deduction works so that we use exec rather than run, bypassing the image's entrypoint when running it with apptainer/singularity. This is necessary for the case where the image has a non-standard entrypoint like the ldmx/dev image.

🐛 Bugs Fixed

• use exec instead of run to avoid entrypoint by @tomeichlersmith in #147

Full Changelog: v1.1.0...v1.1.1