MAINT: Add caosdb_client.json for tests

.gitlab-ci.yml

@@ -100,6 +100,7 @@ test:
   script:
     - .docker/install_cpplib.sh
     - export LD_LIBRARY_PATH=/root/.local/lib:$LD_LIBRARY_PATH
+    - export CAOSDB_CLIENT_CONFIGURATION=$(pwd)/.docker/caosdb_client.json
     # Let's run the tests. Substitute `coverage = false` below, if you
     # do not want coverage results.
     - julia -e 'using Pkg; Pkg.add(path=pwd());

src/CaosDB.jl

@@ -216,4 +216,6 @@ include("Connection.jl")
 
 module Entity end
 
+module Transaction end
+
 end # CaosDB