Install gnupg2 in portal image.

src/Docker/Dockerfile-portal

@@ -1,7 +1,7 @@
 FROM ubuntu AS angular
-RUN apt update
-RUN apt install -y apt-utils
-RUN apt install -y curl
+RUN apt-get update && apt-get install -y gnupg2
+RUN apt-get install -y apt-utils
+RUN apt-get install -y curl
 RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
 RUN apt-get install -y nodejs
 RUN npm install --unsafe-perm -g @angular/cli