fix: broken docker build (OAI#3573)

Author: miqui

Gemfile

@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gem "jekyll", "~> 4.2"
 gem "webrick", "~> 1.7"
 gem "jekyll-remote-theme"
+gem "jekyll-include-cache", "~>0.2.1"
 gem "just-the-docs", "~> 0.4.2"
 
 group :jekyll_plugins do

Gemfile.lock

@@ -31,6 +31,8 @@ GEM
       safe_yaml (~> 1.0)
       terminal-table (>= 1.8, < 4.0)
       webrick (~> 1.7)
+    jekyll-include-cache (0.2.1)
+      jekyll (>= 3.7, < 5.0)
     jekyll-remote-theme (0.4.3)
       addressable (~> 2.0)
       jekyll (>= 3.5, < 5.0)
@@ -81,6 +83,7 @@ PLATFORMS
 
 DEPENDENCIES
   jekyll (~> 4.2)
+  jekyll-include-cache (~> 0.2.1)
   jekyll-remote-theme
   jekyll-sitemap (~> 1.4)
   just-the-docs (~> 0.4.2)