Allow run shell script before importing dump

[kayrus]

If shell script downloads some sql dumps, these dump are not being processed. This PR runs shell scripts first, then process the dump.

[yosifkit]

If you already have a script, why not just have it import the sql without even saving it to a file?

curl -fSL somefile.sql | "${psql[@]}"

[kayrus]

@yosifkit curl can do that, but not rsync or scp...

[yosifkit]

Curl can do sftp connections too: http://unix.stackexchange.com/a/147047. You could also just dump your new sql files into any folder and then import them all with your script and even delete them once done if you need to.

What I am really trying to say is that this would introduce a backwards incompatible change. Some users are probably relying on interspersing their scripts and sql files by naming them correctly.

# possible fake example $ ls /docker-entrypoint-initdb.d/ 2016-01-01-sql-setup-script.sh 2016-01-02-seed-data.sql 2016-02-01-migration-script.sh 2016-02-02-extra-data.sql

[kayrus]

Last example makes sense. Thanks for your time.