Deploying pkgdown docs through travis on githu failing

Reproducing the issue

---
title: "setup"
output: html_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

Start a package project through the gui:  

- File -> New Project -> New directory -> R package  
- call it "test", place it wherever you want

Then start running through the steps below.

```{r}
# To help set up stuff conveniently
library(usethis)

# just take one to pass checks
use_cc0_license("Mo")


use_git()
```

Add initial stuff to the local git repo.

```{bash}
git add .
git commit -m "init"
```

You'll need to have github username etc. set up on you system for this to work
```{r}
use_github(protocol = "https")
```

Enable travis CI

```{r}
use_travis(ext = "com")
```

Set up pkgdown to make package online docs based on your package.

```{r}
use_pkgdown()
```

Add everything so far to the local git repo, then push it upstream to git.

```{bash}
git add .
git commit -m "add travis and more"

git push --set-upstream origin master
```

set pkgdown to build through travis CI
```{r}
use_pkgdown_travis()
```

As instructed by the above output message, use `use_travis_deploy()` from ropenscilabs' [travis](https://github.com/ropenscilabs/travis) package.
```{r}
# Uncomment below lines given need for the packages
# install.package("remotes")
# remotes::install_github("https://github.com/ropenscilabs/travis")
travis::use_travis_deploy()
```


Add the below to .travis.yml
**Note** I changed the `ssh_id` because {travis} no longer uses the key name `id_rsa`
```
before_cache: Rscript -e 'remotes::install_cran("pkgdown")'
deploy:
  provider: script
  script: Rscript -e 'pkgdown::deploy_site_github(ssh_id = Sys.getenv("TRAVIS_DEPLOY_KEY", ""))' 
  skip_cleanup: true
```

```{bash}
git add .
git commit -m "testing deploy"

git push 
```

Travis deploy will fail due to github authenication fail. 
What am I doing wrong?

https://travis-ci.com/github/Athanasiamo/test?utm_medium=notification&utm_source=email