CI: add jekyll build and html proofer (pyOpenSci#94)

Author: lwasser

.github/workflows/build-site.yml

@@ -0,0 +1,38 @@
+name: Build and Jekyll site and run htmlproofer
+
+on:
+  push:
+    branches:
+      - '*'
+
+jobs:
+  github-pages:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the code
+        uses: actions/checkout@v2
+
+      # Use GitHub Actions' cache to shorten build times and decrease load on servers
+      - name: Use cache to shorten build time
+        uses: actions/cache@v1
+        with:
+          path: vendor/bundle
+          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-gems-
+              
+      - name: Build Jekyll site
+        uses: helaili/jekyll-action@v2
+        with:
+          build_only: true
+          build_dir: _site
+
+      - name: all dirs
+        run: |
+          ls
+          pwd
+
+      - name: Check HTML using htmlproofer
+        uses: chabad360/htmlproofer@master
+        with:
+          directory: '_site'

_config.yml

@@ -21,7 +21,7 @@ title_separator          : "-"
 name                     : "pyOpenSci"
 description              : "pyOpenSci's Website"
 url                      : "https://www.pyopensci.org/" # the base hostname & protocol for your site e.g. "https://mmistakes.github.io"
-baseurl                  : # the subpath of your site, e.g. "/blog"
+baseurl                  : ""# the subpath of your site, e.g. "/blog"
 repository               : "pyopensci/pyopensci.github.io" # GitHub username/repo-name e.g. "mmistakes/minimal-mistakes"
 teaser                   : # path of fallback teaser image, e.g. "/assets/images/500x300.png"
 logo                     : "/images/logo.png" # path of logo image to display in the masthead, e.g. "/assets/images/88x88.png"