docker: add syntax config and make use of --link

[coveralls]

Pull Request Test Coverage Report for Build 4175671504

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.028%

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Totals
Change from base Build 4166527644:	0.0%
Covered Lines:	641
Relevant Lines:	712

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💛 - Coveralls