Donal McBreen e441399255 Add kamal secrets print for secret debugging ...

Dotenv's variable substitution doesn't work the same way as commands run
in the shell. It needs values to be escaped.

```sh
$ cat /tmp/env
SECRETS=$(cat /tmp/json)
SECRETS2=$(echo $SECRETS | jq)
$ cat /tmp/json
\{\ \"foo\"\ :\ \"bar\" \}
$ SECRETS=$(cat /tmp/json)
$ SECRETS2=$(echo $SECRETS | jq)
jq: parse error: Invalid numeric literal at line 1, column 2
$ ruby -e 'require "dotenv"; puts Dotenv.parse("/tmp/env")["SECRETS2"]'
{
  "foo": "bar"
}
```

Since you then can't use the shell to debug, `kamal secrets print` will
allow you to see what the secrets will be set to.

2024-09-30 12:28:29 +01:00

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