Publishing CAP warnings from filenames with multiple dots is handled incorrectly

[nimhbg]

It is assumed here that the filename uploaded to the wis2box-incoming bucket contains a single dot. But that may not and does not have to be the case.

Example:

1. Upload a CAP warning file named foo.bar1.xml to wis2box-incoming bucket.
2. This will result in a file named foo.xml in the wis2box-public bucket when the workflow is executed by the wis2box-management container.
3. Upload another different CAP warning file named foo.bar2.xml to wis2box-incoming.
4. This will result in the same file foo.xml in wis2box-public and so the first CAP warning file will be overwritten and lost.