changes made to make TTK root file system as readonly causing failure to download response map files

[shashi165]

Summary: With the changes made to TTK to make root file system readonly were causing failures in sdk bulk and request2pay tests

1. Initially it was not able to download the spec files
2. we added the spec files directly in ttk repo to make the sdk bulk tests work
3. Now it is failing to download the response rules causing the request2pay tests to fail

the file /opt/app/spec_files/rules_response/default.json contains the URL instead of actual contents https://raw.githubusercontent.com/mojaloop/sdk-scheme-adapter/v24.10.5/test/func_bulk/config/ttk-ttksim1/spec_files/rules_response/default.json

Error:

2025-08-20T16:33:16.763Z - info: Request: post /transactionrequests
2025-08-20T16:33:16.763Z - info: {
  request: {
    uniqueId: '175570759676397pxun',
    headers: {
      'content-type': 'application/json',
      accept: 'application/json',
      date: 'Wed, 20 Aug 2025 16:33:16 GMT',
      'user-agent': 'axios/1.8.2',
      'content-length': '406',
      'accept-encoding': 'gzip, compress, deflate, br',
      host: 'moja-ttksim2-ttk-backend:4040',
      connection: 'keep-alive'
    },
    queryParams: [Object: null prototype] {},
    body: {
      transactionRequestId: '01K3457QQJ68JD53XF2YFRAY5Y',
      to: [Object],
      from: [Object],
      amount: '123',
      currency: 'XTS',
      transactionType: 'DEPOSIT',
      initiator: 'PAYEE',
      initiatorType: 'CONSUMER'
    }
  }
}
2025-08-20T16:33:16.763Z - info: API matched: mojaloop_simulator_inbound
2025-08-20T16:33:16.764Z - error: Response info not found for method in response map file for post /transactionrequests
2025-08-20T16:33:16.764Z - info: Response: post /transactionrequests Status: undefined

Severity: High

Priority: Critical

Expected Behavior The sdk bulk, request2pay and thirdparty tests should pass

Steps to Reproduce

1. deploy the mojaloop in sdk_bulk/request2pay configuration with ttk version v18.14.4
2. run the tests
3. observe the failure in request2pay tests

Specifications

• Component (if known): ml-testing-toolkit
• Version: v18.14.4
• Platform: mojaloop helm
• Subsystem: ttk backend
• Type of testing: release candidate testing
• Bug found/raised by: @shashi165 , @elnyry-sam-k

Notes:

• Severity when opened: High
• Priority when opened: Critical