global: addition of files

[drjova]

• Adds files key to all publishers.

[drjova]

Springer

{
"files": {
"pdfa": "scoap3/10.1140/epjc/s10052-019-6540-y/10052_2019_Article_6540.pdf",
"xml": "scoap3/10.1140/epjc/s10052-019-6540-y/10052_2019_Article_6540.xml.Meta",
}
}

OUP

{
"files": {
'xml': 'scoap3/10.1093/ptep/ptac120/ptac120.xml',
'pdf': 'scoap3/10.1093/ptep/ptac120/ptac120.pdf',
'pdfa': 'scoap3/10.1093/ptep/ptac120/ptac120.pdf'
}
}

SCOAP3_BUCKET_NAME should be set