[launcher] Fix token directory permission

[jkl73]

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Current token directory has permission drw-r--r--, so only root can access the token file inside. This is fine if the container process is run as root. But if the container process is run as a non-root user, it won't be able to access the token file.

Change the permission so any process can access the token file.

Changing the permission of /tmp/container_runner directory drw-r-xr-x