[CI] Add smoke tests of building a Docsy site from scratch #1100
Description
Consider adding a smoke test along the lines of what was proposed in #1075 (comment):
$ hugo new site myproject
...
$ cd myproject
$ git init # required for the git submodule command to work
...
$ git submodule add --depth 1 https://github.com/google/docsy.git themes/docsy
...
$ echo 'theme = "docsy"' >> hugo.toml
$ (cd themes/docsy && npm install)
...
$ npm init -y
$ npm install -D autoprefixer postcss-cli postcss
...
$ hugo -v
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