fix: separate swagger generation from server run

Description

Separating swagger file writing to the disk from running the application with env flag.

Related issues

No related issues

Testing

No testing required.

Checklist

• I have updated the documentation (if necessary)
• I have added unit tests for new functionality (if applicable)
• My code follows the style guidelines of this project
• I have tested this code on my local machine before submitting this MR

Reviewers

@alexey.lunin @boyan.tsolov

Additional Notes

Closes #25 (closed)

.env.example

@@ -35,3 +35,4 @@ ATTESTATION_SERVICE_HOST=0.0.0.0
 PROOF_SERVICE_TCP_PORT=8884
 PROOF_SERVICE_HOST=0.0.0.0
 
+SWAGGER=false