DOCKER.md: remove leftover dc- references

[valentijnscholten]

dc-unittest.sh -> run-unittest.sh

[dryrunsecurity]

DryRun Security Summary

The documentation update simply renames a test script from dc-unittest.sh to run-unittest.sh in Docker Compose testing instructions, with no security issues identified.

Expand for full summary

The PR updates Docker documentation, renaming a script from dc-unittest.sh to run-unittest.sh in the Docker Compose test instructions. No security vulnerabilities found.

Code Analysis

We ran 9 analyzers against 1 file and 0 analyzers had findings. 9 analyzers had no findings.

View PR in the DryRun Dashboard.

[mtesauro]

Approved