`test_rest_gateway_docker_compose.sh` with hard coded JWT secret: `Token validation error: token signature is invalid: signature is invalid`

[michimussato]

Describe the bug
Running test_rest_gateway_docker_compose.sh against a rest_gateway container with a JWT_SECRET set other than
default-secret-key, most tests fail. Make sure tests respect JWT_SECRET environment variable if set:

OpenCue/rest_gateway/test_rest_gateway_docker_compose.sh

Line 16 in ce61412

secret = 'default-secret-key'

To Reproduce
Steps to reproduce the behavior:
Result with JWT_SECRET set in environment (value: my-jwt-secret):

Testing OpenCue REST Gateway with Docker Compose
=================================================
Checking Docker Compose services...
NAME      IMAGE     COMMAND   SERVICE   CREATED   STATUS    PORTS

Generating JWT token...
JWT token generated (length: 124)

Testing REST Gateway endpoints...
================================

1. Testing GetShows...
GetShows: FAILED
Response: Token validation error: token signature is invalid: signature is invalid

2. Testing GetJobs...
GetJobs: FAILED
Response: Token validation error: token signature is invalid: signature is invalid

3. Testing GetHosts...
GetHosts: FAILED
Response: Token validation error: token signature is invalid: signature is invalid

4. Testing FindShow...
FindShow: FAILED
Response: Token validation error: token signature is invalid: signature is invalid

5. Testing Frame Interface...
5a. GetFrame (will fail if no frame ID provided, but tests endpoint):
GetFrame: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid
...

6. Testing Layer Interface...
6a. GetLayer (will fail if no layer ID provided, but tests endpoint):
GetLayer: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid
...

7. Testing Group Interface...
7a. FindGroup:
FindGroup: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid

8. Testing Owner Interface...
8a. GetOwner:
GetOwner: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid

9. Testing Proc Interface...
9a. GetProc:
GetProc: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid
...

10. Testing Deed Interface...
10a. GetOwner (deed):
DeedInterface.GetOwner: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid
...

11. Testing Additional Job Interface Methods...
11a. FindJob:
FindJob: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid

12. Testing Additional Show Interface Methods...
12a. CreateShow (will likely fail due to permissions, but tests endpoint):
CreateShow: SUCCESS (endpoint accessible)
Token validation error: token signature is invalid: signature is invalid
...

13. Testing REST Gateway Status...
REST Gateway Response Status: Token validation error: token signature is invalid: signature is invalid
HTTP Status: 401

Testing Complete!
=================

Tested Interfaces and Available Endpoints:
  - Show Interface: GetShows , FindShow , CreateShow 
  - Job Interface: GetJobs , FindJob , GetFrames, Kill, Pause, Resume
  - Frame Interface: GetFrame , Retry, Kill, Eat
  - Layer Interface: GetLayer , FindLayer, GetFrames, Kill
  - Group Interface: FindGroup , GetGroup, SetMinCores, SetMaxCores
  - Host Interface: GetHosts , FindHost, GetHost, Lock, Unlock
  - Owner Interface: GetOwner , SetMaxCores, TakeOwnership
  - Proc Interface: GetProc , Kill, Unbook
  - Deed Interface: GetOwner , GetHost

Note:  indicates endpoints tested in this script
      Other endpoints are available but not tested here

REST Gateway URL: http://localhost:8448
JWT Token (valid for 1 hour): eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyIjoidGVzdCIsImV4cCI6MTc2NjI0MDAzMH0.A94hwpDsffM0KRMaUcigHUamaeAOLrzk6HG_15C8y4s

Example usage:
   curl -H "Authorization: Bearer $JWT_TOKEN" \
        -H "Content-Type: application/json" \
        -X POST "http://localhost:8448/<interface>.<InterfaceName>/<MethodName>" \
        -d '{"param": "value"}'

Expected behavior
Test script uses JWT_SECRET from environment if set. If not, use default secret.