Install libvips in CI

Author: zetter-rpf

.github/workflows/ci.yml

@@ -103,7 +103,7 @@ jobs:
       - name: Install test dependencies
         run: >
           sudo apt-get update && sudo apt-get install --yes --no-install-recommends
-          build-essential git libpq-dev pkg-config postgresql-client jq curl imagemagick
+          build-essential git libpq-dev pkg-config postgresql-client jq curl imagemagick libvips
 
       - name: Set up Firefox
         uses: browser-actions/setup-firefox@v1