Don't prompt for yes/no questions.

.github/setup_ci.sh

@@ -11,6 +11,7 @@ TARGETS=$@
 
 PACKAGES=""
 INSTALL_FIDO_PPA="no"
+export DEBIAN_FRONTEND=noninteractive
 
 #echo "Setting up for '$TARGETS'"
 
@@ -79,8 +80,8 @@ done
 
 if [ "yes" = "$INSTALL_FIDO_PPA" ]; then
     sudo apt update -qq
-    sudo apt install software-properties-common
-    sudo apt-add-repository ppa:yubico/stable
+    sudo apt install -qy software-properties-common
+    sudo apt-add-repository -y ppa:yubico/stable
 fi
 
 if [ "x" != "x$PACKAGES" ]; then