0.0.94

Overview of changes

• Add contribution guidelines
• Add fedora-toolbox image definition for Fedora 34
• Add more information to errors from creating symbolic links when setting up
  the toolbox container in the entry point
• Ensure binaries built on Fedora 33 run on Fedoras 32 & 31
• Install the tests
• Make it more obvious when falling back to /bin/bash
• Document that sudo(8) should work without a password
• Mount a tmpfs at /tmp to match the host
• Update issue templates