Can't add `templates` directory

[ajrice6713]

Attempting to create a POC with Tyk and mutate a request body to add a field before it is forwarded to the proxied URL - but I am getting an error from docker that isnt entirely clear when attempting to add templates to the root and as a volume in docker-compose.yml

My docker-compose file:

version: '3.3'
services:
  tyk-gateway:
    image: docker.tyk.io/tyk-gateway/tyk-gateway:v4.1.0
    ports:
      - 8080:8080
    networks:
      - tyk
    volumes:
      - ./tyk.standalone.conf:/opt/tyk-gateway/tyk.conf
      - ./apps:/opt/tyk-gateway/apps
      - ./middleware:/opt/tyk-gateway/middleware
      - ./templates:/opt/tyk-gateway/templates
      - ./certs:/opt/tyk-gateway/certs
    environment:
      - TYK_GW_SECRET=foo
    depends_on:
      - tyk-redis
  tyk-redis:
    image: redis:6.2.7-alpine
    networks:
      - tyk
    ports:
      - 6379:6379

networks:
  tyk:

./templates/add_app_id.tmpl:

{
    "to": "{{.to}}",
    "from": "{{.from}}",
    "text": "{{.text}}",
    "applicationId" : "abc123",  /* attempting to inject this string into every request body */
}

./apps/keyless-plugin-api.json:

{
  "name": "Tyk Test Keyless API",
  "api_id": "keyless",
  "org_id": "default",
  "definition": {
    "location": "header",
    "key": "version"
  },
  "use_keyless": true,
  "version_data": {
    "not_versioned": true,
    "versions": {
      "Default": {
        "name": "Default",
        "use_extended_paths": true,
        "extended_paths": {
          "transform": [
            {
              "path": "/keyless-test",
              "method": "POST",
              "template_data": {
                "template_mode": "file",
                "template_source": "./templates/add_app_id.tmpl",
                "input_type": "json",
                "enable_session": true
              }
            }
          ]
        }
      }
    }
  },
  "custom_middleware": {
    "pre": [
      {
        "name": "testJSVMData",
        "path": "./middleware/injectHeader.js",
        "require_session": false,
        "raw_body_only": false
      }
    ]
  },
  "driver": "otto",
  "proxy": {
    "listen_path": "/keyless-test",
    "target_url": "https://myService.m.pipedream.net/api/v1",
    "strip_listen_path": false
  }
}

Error from docker when running docker compose up -d:

time="Dec 19 21:24:03" level=info msg="Tyk API Gateway 4.1.0" prefix=main
time="Dec 19 21:24:03" level=warning msg="Insecure configuration allowed" config.allow_insecure_configs=true prefix=checkup
time="Dec 19 21:24:03" level=error msg="Could not set version in versionStore" error="storage: Redis is either down or was not configured" prefix=main
time="Dec 19 21:24:03" level=error msg="cannot set key in pollerCacheKey" error="storage: Redis is either down or was not configured"
time="Dec 19 21:24:03" level=info msg="Starting Poller" prefix=host-check-mgr
panic: html/template: pattern matches no files: `/opt/tyk-gateway/templates/error*`
goroutine 1 [running]:
html/template.Must(...)
/usr/local/go/src/html/template/template.go:372
github.com/TykTechnologies/tyk/gateway.(*Gateway).setupGlobals(0xc00012b000)
/go/src/github.com/TykTechnologies/tyk/gateway/server.go:374 +0x20c9
github.com/TykTechnologies/tyk/gateway.(*Gateway).initialiseSystem(0xc00012b000, 0x37c37275f7444d85, 0xc00013d620)
/go/src/github.com/TykTechnologies/tyk/gateway/server.go:1169 +0x44c
github.com/TykTechnologies/tyk/gateway.Start()
/go/src/github.com/TykTechnologies/tyk/gateway/server.go:1469 +0x296
main.main()
/__w/tyk/tyk/main.go:8 +0x25