Update entrypoint.sh

[mheadd]

Eval and run command strings rather than exec.

Changes proposed in this pull request:

• Carries over changes made to the main branch to the v7 branch, using the same approach in both branches.
• Eval command strings
• Exit process with cf exit code

Security considerations

Removes exec in favor of eval.

[mheadd]

@mogul want you to review prior to merging.

[mogul]

How does the exit value get returned? Don't you need to exit $??

[mogul]

Also I don't have enough context... Why avoid exec?

[mheadd]

@mogul You had approved the same change in the main branch, so wanted to make sure that the v7 branch, which I know data.gov makes use of, was consistent.

[mogul]

I'm approving since it's just porting the change over from the other branch, but it seems like it might be better/safer to use a subshell to get around quoting issues.
https://stackoverflow.com/questions/17529220/why-should-eval-be-avoided-in-bash-and-what-should-i-use-instead