ci: Run GDC build with GDC 10 by default

tests/ci/Dockerfile

@@ -7,7 +7,7 @@ FROM debian:testing
 RUN apt-get update -qq
 
 # install build essentials
-RUN apt-get install -yq git gcc gdc ldc
+RUN apt-get install -yq git gcc gdc ldc gdc-10
 
 # install dependencies used by both appstream and appstream-generator
 RUN apt-get install -yq --no-install-recommends \

tests/ci/build_and_test.sh

@@ -6,6 +6,11 @@
 set -e
 export LANG=C.UTF-8
 
+if [ "$DC" == "gdc" ]
+then
+  export DC="gdc-10"
+fi
+
 echo "D compiler: $DC"
 set -v
 $DC --version