Update entrypoint.sh

Fixed error causing Ferdi-server's Adonis APP_KEY not to be read from FERDI_APP_KEY.txt on container restart, which was causing the following error:
```
RuntimeException: E_MISSING_APP_KEY: Make sure to define appKey inside config/app.js file before using Encryption provider
> More details: https://err.sh/adonisjs/errors/E_MISSING_APP_KEY
RuntimeException: E_MISSING_APP_KEY: Make sure to define appKey inside config/app.js file before using Encryption provider
> More details: https://err.sh/adonisjs/errors/E_MISSING_APP_KEY
    at Function.missingAppKey (/app/node_modules/@adonisjs/generic-exceptions/src/RuntimeException.js:54:12)
    at new Encryption (/app/node_modules/@adonisjs/framework/src/Encryption/index.js:33:33)
    at Object.closure (/app/node_modules/@adonisjs/framework/providers/AppProvider.js:257:14)
    at Ioc._resolveBinding (/app/node_modules/@adonisjs/fold/src/Ioc/index.js:231:68)
    at Ioc.make (/app/node_modules/@adonisjs/fold/src/Ioc/index.js:807:19)
    at /app/node_modules/@adonisjs/fold/src/Ioc/index.js:318:19
    at Array.map (<anonymous>)
    at Ioc._makeInstanceOf (/app/node_modules/@adonisjs/fold/src/Ioc/index.js:317:44)
    at Ioc.make (/app/node_modules/@adonisjs/fold/src/Ioc/index.js:799:19)
    at AuthManager.getScheme (/app/node_modules/@adonisjs/auth/src/Auth/Manager.js:86:16)
    at Auth.authenticator (/app/node_modules/@adonisjs/auth/src/Auth/index.js:118:40)
    at new Auth (/app/node_modules/@adonisjs/auth/src/Auth/index.js:68:39)
    at Context.<anonymous> (/app/node_modules/@adonisjs/auth/providers/AuthProvider.js:151:14)
    at Context.wrappedCallback [as auth] (/app/node_modules/macroable/index.js:132:61)
    at Server._handleException (/app/node_modules/@adonisjs/framework/src/Server/index.js:253:63)
    at /app/node_modules/@adonisjs/framework/src/Server/index.js:441:14
```

1 files changed, 1 insertions, 1 deletions

diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
index 0679530..2d1fd89 100755
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -18,7 +18,7 @@ EOL
 if  [[ -f "${DATA_DIR}/FERDI_APP_KEY.txt" ]]; then
         echo " "
         echo "**** App Key found ****"
-        APP_KEY=$(echo "${APP_KEY}")
+        APP_KEY=$(cat /data/FERDI_APP_KEY.txt)
         echo "**** App Key set to $APP_KEY you can modify FERDI_APP_KEY.txt to update your key ****"
 elif [[ -z "${APP_KEY}" ]]; then
         echo "**** Generating Ferdi-server app key for first run ****"