Install `libidn11-dev` for build & docker

.docker/ruby/Dockerfile

@@ -12,9 +12,10 @@ RUN curl -sL https://deb.nodesource.com/setup_12.x | bash -
 
 RUN apt-get update -qq \
     && apt-get install -y --no-install-recommends build-essential \
-    libpq-dev postgresql-client \ 
+    libpq-dev postgresql-client \
     libxml2-dev libxslt1-dev \
     libmagickwand-dev imagemagick \
+    libidn11-dev \
     nodejs \
     yarn \
     && rm -rf /var/lib/apt/lists/*

.github/workflows/retrospring.yml

@@ -52,7 +52,7 @@ jobs:
         with:
           node-version: '12'
       - name: Install dependencies
-        run: sudo apt update && sudo apt-get install -y libpq-dev libxml2-dev libxslt1-dev libmagickwand-dev imagemagick
+        run: sudo apt update && sudo apt-get install -y libpq-dev libxml2-dev libxslt1-dev libmagickwand-dev imagemagick libidn11-dev
       - name: Copy default configuration
         run: |
           cp config/database.yml.postgres config/database.yml