Add dockerfilec omment

Signed-off-by: Fred Boniface <fred@fjla.uk>

Dockerfile

@@ -5,6 +5,7 @@ COPY ./.npmrc ./
 RUN npm install
 COPY . .
 # Ideally the tests should be run separately in a CI/CD workflow rather than during the build
+# Currently, it does prevent a container being published with failing tests
 RUN npm run test
 RUN npm run build