ci: sync tests/README.md to docs

[v-scharf]

sync https://github.com/opencloud-eu/opencloud/blob/main/tests/README.md to https://docs.opencloud.eu/docs/next/dev/server/

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 12 complexity · 0 duplication

Metric	Results
Complexity	12
Duplication	0

View in Codacy

🟢 Coverage ∅ diff coverage · +0.03% coverage variation

Metric	Results
Coverage variation	✅ +0.03% coverage variation (-1.00%)
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (9041ee8)	82496	19120	23.18%
Head commit (512fd57)	82496 (+0)	19145 (+25)	23.21% (+0.03%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3164)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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TIP This summary will be updated as you push new changes.}