add NPMRC to docker image as arg

project-maven-azure-docker/buildV2.yml

+build:
+  image: $ACR_URL/docker:dind
+  stage: build
+  services:
+    - docker:dind
+
+  tags:
+    - docker
+  script:
+    - docker login -u $ACR_USERNAME -p $ACR_PASSWORD $ACR_URL
+    - docker image build --build-arg REG=https://artifact.tecnalia.com/artifactory/api/npm/digicon-npm-dev/ --build-arg NPM_TKN=$NPM_TOKEN --build-arg US=$ACR_USERNAME --build-arg NPMRC=$NPMRC --build-arg CI_TOKEN=$ACR_PASSWORD -t $CONTAINER_IMAGE ./
+    - docker push $CONTAINER_IMAGE
+  only:
+    - master  
+    - main