Specifying shell

## Describe the bug

I wanted to specify the shell to use bash. Adding #!/bin/bash and #!/usr/bin/env bash does not work. I tried enclosing the whole script with bash -c but still unfortunate

## Yaml Config

Please post your Yaml configuration file along with the output results.

```yaml
script:
#!/usr/bin/env bash
source .venv/bin/activate
```

## Related environment

Please provide the following information:

Digital Ocean