Add service id to server check command

[MarcelGeo]

• admins can use it by setting connections for boxy

[coveralls]

Pull Request Test Coverage Report for Build 14337514750

Details

• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 92.226%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
server/mergin/commands.py	0	6	0.0%

Totals
Change from base Build 14238018722:	-0.07%
Covered Lines:	6893
Relevant Lines:	7474

---

💛 - Coveralls