Set cat-gateway as the container entrypoint

[benbooth493]

Description

Set the container entrypoint to cat-gateway binary.

Related Issue(s)

#50

Description of Changes

Remove entry.sh from the container and set the entrypoint as the cat-gateway binary.

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 292/292}$ | ${\color{red}Fail: 0/292}$ |

[saibatizoku]

Looks good to me, although it seems to me like the commented lines should be removed if they will not be used.

[benbooth493]

Removed commented out code as requested