Link checks on deploy (alshedivat#2079)

Added another GitHub action to check for broken local links on version
of the site that will be deployed.

The `broken-links` action check for broken links considering
documentation files (like INSTALLING.md) and also pages like
[_pages/about.md](https://github.com/alshedivat/al-folio/blob/master/_pages/about.md),
but it can't check for broken links when the link will be handled by
jekyll tags (like in
[_pages/blog.md](https://github.com/alshedivat/al-folio/blob/master/_pages/blog.md).

With `broken-links-site` we can check if all the links that will be used
on the final site that refer to local files are correct. Focusing only
on local files since this would end up calling too many checks for
library files, like
`https://unpkg.com/bootstrap-table@1.22.1/dist/bootstrap-table.min.css`.

---------

Signed-off-by: George Araújo <george.gcac@gmail.com>

.github/workflows/broken-links-site.yml

@@ -0,0 +1,52 @@
+name: Check for broken links on site
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+    branches:
+      - master
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  deploy:
+    # available images: https://github.com/actions/runner-images#available-images
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v3
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2.2"
+          bundler-cache: true
+      - name: Update _config.yml ⚙️
+        uses: fjogeleit/yaml-update-action@v0.13.1
+        with:
+          commitChange: false
+          valueFile: "_config.yml"
+          changes: |
+            {
+              "giscus.repo": "${{ github.repository }}",
+              "baseurl": ""
+            }
+      - name: Install and Build 🔧
+        run: |
+          pip3 install --upgrade jupyter
+          npm install -g mermaid.cli
+          npm install -g purgecss
+          export JEKYLL_ENV=production
+          bundle exec jekyll build --lsi
+          purgecss -c purgecss.config.js
+      - name: Link Checker 🔗
+        uses: lycheeverse/lychee-action@v1.9.0
+        with:
+          fail: true
+          # only check local links
+          args: --offline --remap '_site(/?.*)/assets/(.*) _site/assets/$2' --verbose --no-progress '_site/**/*.html'

.github/workflows/deploy.yml

@@ -1,4 +1,4 @@
-name: deploy
+name: Deploy site
 
 on:
   push:

.github/workflows/prettier.yml

@@ -1,4 +1,4 @@
-name: prettier
+name: Prettier code formatter
 
 on:
   push: