install libvips for gh-pages and gitpod

Author: lukashass

.github/workflows/deploy-pages.yml

@@ -0,0 +1,61 @@
+# Combination of
+# https://gist.github.com/elstudio/38bacfe7aab63da082a418fd3a1ddb66
+# https://github.com/actions/starter-workflows/blob/3e10d18ba714b1c612e15b635b298a6283000c4b/pages/jekyll.yml
+
+name: Deploy Jekyll site to Pages
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: [$default-branch, resize-images]
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      # Jekyll Picture Tag requires libvips libraries for resizing images, which must be installed
+      - name: Install JPT's dependencies
+        run: sudo apt-get install libvips-tools
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.1' # Not needed with a .ruby-version file
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          cache-version: 0 # Increment this number if you need to re-download cached gems
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v2
+      - name: Build with Jekyll
+        # Outputs to the './_site' directory by default
+        run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
+        env:
+          JEKYLL_ENV: production
+      - name: Upload artifact
+        # Automatically uploads an artifact from the './_site' directory by default
+        uses: actions/upload-pages-artifact@v1
+
+  # Deployment job
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1

.gitpod.Dockerfile

@@ -0,0 +1,4 @@
+FROM gitpod/workspace-full
+
+RUN apt update \
+    && apt install -y libvips

.gitpod.yml

@@ -1,3 +1,6 @@
+image:
+  file: .gitpod.Dockerfile
+
 tasks:
   - name: development server
     init: make install

Gemfile

@@ -4,4 +4,4 @@ gemspec
 gem 'jekyll-seo-tag'
 gem 'wdm', '>= 0.1.0' if Gem.win_platform?
 gem "webrick", "~> 1.7"
-gem 'jekyll_image_processing', git: 'https://github.com/benubois/jekyll_image_processing'
+gem 'jekyll_image_processing', git: 'https://github.com/benubois/jekyll_image_processing'