Github Actions building R install packages syntax error near unexpected token `c’

When trying to run the r-lib/actions/setup-r for R in Github Actions installing the dependencies.

syntax error near unexpected token `c'

The pipeline yaml file

name: R

on:
  push:
    branches: [ main, feature/* ]
  pull_request:
    branches: [ main ]

jobs:
  build:
    runs-on: macOS-latest

    steps:
    - uses: actions/checkout@master
    - uses: r-lib/actions/setup-r@v1
      with:
        r-version: '3.5.3' # The R version to download (if necessary) and use.
    - name: Install dependencies
      run: |
        install.packages(c("gmodels", "class"))
        remotes::install_deps(dependencies = TRUE)

I was missing adding shell: Rscript {0} at the end so the Install dependencies will be

- name: Install dependencies
      run: |
        install.packages(c("gmodels", "class"))
        remotes::install_deps(dependencies = TRUE)
        shell: Rscript {0}

Source: https://github.com/r-lib/actions/tree/master/examples