Update the ng-cli image that is used in building pipelines (fix for #36)

ci-templates/build.yml

@@ -26,7 +26,7 @@
 .angular_build:
   extends: .default
   stage: build
-  image: trion/ng-cli:14.2.6
+  image: trion/ng-cli:13.3.7
   script:
     - |
       if [ ! -f  "./src/assets/config/theming.scss" ]; then

ci-templates/build_unprotected.yml

@@ -20,7 +20,7 @@
 .angular_build:
   extends: .default
   stage: build
-  image: trion/ng-cli:14.2.6
+  image: trion/ng-cli:13.3.7
   script:
     - |
       if [ ! -f  "./src/assets/config/theming.scss" ]; then