Fix LABEL in Dockerfile, should be key=value

[h3ssan]

Modified Files

• data/Dockerfiles/acme/Dockerfile
• data/Dockerfiles/backup/Dockerfile
• data/Dockerfiles/clamd/Dockerfile
• data/Dockerfiles/dockerapi/Dockerfile
• data/Dockerfiles/dovecot/Dockerfile
• data/Dockerfiles/netfilter/Dockerfile
• data/Dockerfiles/olefy/Dockerfile
• data/Dockerfiles/phpfpm/Dockerfile
• data/Dockerfiles/postfix/Dockerfile
• data/Dockerfiles/rspamd/Dockerfile
• data/Dockerfiles/sogo/Dockerfile
• data/Dockerfiles/solr/Dockerfile
• data/Dockerfiles/unbound/Dockerfile
• data/Dockerfiles/watchdog/Dockerfile

Description

Referring to the Official Docker Docs, clearly said the format of LABEL is

LABEL <key>=<value> <key>=<value> <key>=<value> ...

But the mentioned files are written as follows:

LABEL <value>

Also in the resource of Docker Docs, there it said:

The LABEL instruction adds metadata to an image. A LABEL is a key-value pair

[DerLinkman]

Looks fine!