Install curl in CI workflow

Change-Id: Ib35f83f6a023be311c8bf39b04ae544e5d618d2a
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c2bdd1d..1800a61 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -23,7 +23,7 @@
 
     - start_section install_linux_packages "Installing missing Linux packages"
     - apt-get update
-    - apt-get install -y libu2f-udev fonts-liberation build-essential libglpk40 libcurl4-gnutls-dev libxml2-dev libsodium-dev libsecret-1-dev libfontconfig1-dev libssl-dev libxt6 libpq-dev imagemagick
+    - apt-get install -y libu2f-udev fonts-liberation build-essential libglpk40 libcurl4-gnutls-dev libxml2-dev libsodium-dev libsecret-1-dev libfontconfig1-dev libssl-dev libxt6 libpq-dev imagemagick curl
     - locale-gen de_DE.utf8 en_GB.utf8 en_US.utf8
 
     - end_section install_linux_packages