feat: allow running without wallet props if running in-memory ledger

[ghost]

Overview

Prevously - PRISM Node cannot be run in-memory without creating secrets for cardano wallet - which aren’t used

Now → Allow PRISM node to run without the need for secrets - this means don’t specify the environment variables and pull from secrets unless it’s actually running against a real test-net

Screenshots

Checklists

Pre-submit checklist:

• Self-reviewed the diff
• New code has proper comments/documentation/tests
• Any changes not covered by tests have been tested manually
• The README files are updated
• If new libraries are included, they have licenses compatible with our project
• If there is a db migration altering existing tables, there is a proper migration test

Pre-merge checklist:

• Commits have useful messages
• Review clarifications made it into the code

[atala-dev]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors
✅ REPOSITORY	dustilock	yes		no
✅ REPOSITORY	git_diff	yes		no
✅ REPOSITORY	syft	yes		no

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[github-actions]

Unit Test Results

328 tests  ±0   327 ✔️ ±0   37s ⏱️ -1s
  48 suites ±0       1 💤 ±0 
  48 files   ±0       0 ❌ ±0 

Results for commit 67fc735. ± Comparison against base commit 30a8164.