fix api-db fix-permissions permissions to actually fix api-db permissions

[tobybellwood]

Because this step was previously called under the mysql user to operate on files/folders owned by root, it would fail (silently - because of uselagoon/lagoon-images#420).

This PR moves the chown and fix-permissions into the USER root block, ensuring that they are correctly set prior to changing user back to mysql.

previously:

/var/lib/mysql$ ls -al /docker-entrypoint-initdb.d
total 80
drwxrwxr-x    1 mysql    root          4096 Mar 16 05:41 .
drwxr-xr-x    1 root     root          4096 Mar 16 07:01 ..
-rw-rw-r--    1 root     root         13641 Mar 16 05:40 00-tables.sql
-rw-rw-r--    1 root     root         41063 Mar 16 05:40 01-migrations.sql
-rw-rw-r--    1 root     root            30 Mar  9 06:06 02-views.sql
-rw-rw-r--    1 root     root          1250 Mar  9 06:06 03-procedures.sql
-rwxrwxr-x    1 root     root          1373 Mar  9 06:06 04-generate-ssh-key-fingerprints.sh

After this PR

/var/lib/mysql$ ls -al /docker-entrypoint-initdb.d
total 80
drwxrwxr-x    1 mysql    root          4096 Mar 25 01:17 .
drwxr-xr-x    1 root     root          4096 Mar 25 02:13 ..
-rw-rw-r--    1 mysql    root         13641 Mar 17 02:14 00-tables.sql
-rw-rw-r--    1 mysql    root         41063 Mar 17 02:14 01-migrations.sql
-rw-rw-r--    1 mysql    root            30 Mar 17 02:14 02-views.sql
-rw-rw-r--    1 mysql    root          1250 Mar 17 02:14 03-procedures.sql
-rwxrwxr-x    1 mysql    root          1373 Dec 14 08:38 04-generate-ssh-key-fingerprints.sh