Optimize image build time, add multi-stage builds, and document technical debt (#53)

- Creates optional docker build args to build minimal image for testing purposes
- Adds documentation of technical debt for future reference

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: prasadtalasila <prasadtalasila@users.noreply.github.com>
Co-authored-by: DisasterlyDisco <aleksander.r.m@protonmail.com>

Author: 3 people

.gitignore

@@ -92,4 +92,6 @@ workspaces/test/dtaas/certs/**
 dist/
 build/
 *.egg-info/
-.coverage
+.coverage
+
+workspaces/src/admin/config.env