Add missing backslash on container ENTRYPOINT

[0x2b3bfa0]

Silly mistake that I missed when reviewing #716: if ENTRYPOINT doesn't contain a valid JSON array, it's going to be interpreted as a shell command, producing errors like the following:

sh: [/bin/bash,: No such file or directory

It's breaking all our GitLab tests, but it should not, as CML has not been released since July 28th. 🤔 Has somebody manually deployed our container images lately?

[casperdcl]

🤦

[0x2b3bfa0]

Merging with GitLab tests in red for obvious reasons.

[casperdcl]

The docker images are deployed both on release & on schedule to grab updates.

cml/.github/workflows/test-deploy.yml

Lines 155 to 157 in d1daa8d

	push:
	${{ github.event_name == 'release' || github.event_name ==
	'schedule' }}

[0x2b3bfa0]

🤦🏼 (my turn)