Action headers not loading environment variable with space in value

### Version Information

Server Version: v2.15.1

### Environment

Hasura running in Docker container

### What is the current behaviour?

When setting up an action with Headers from env var, variables with spaces in them are not sent. I have quoted the environment variable in my .env file when starting the docker container, but this doesn't work.

### What is the expected behaviour?

The entire header is sent, space and all.

### How to reproduce the issue?

1. Create an environment file with a value that has a header inside

for example

```
AUTHORIZATION="Bearer 123412341234"
```

2. Start Hasura container and load the environment variable
3. Create an action that sends the environment variable as a header value

### Please provide any traces or logs that could help here.

I get this as the response when attempting to run the action while it's using the environment variable

```
{
"errors": [
{
"extensions": {
"code": "unexpected",
"path": "$"
},
"message": "OAuth token is missing"
}
]
}
```

### Any possible solutions/workarounds you're aware of?

It works correctly if I put the value of the header in directly

### Keywords

- environment variable
- space
- .env