Add curl

Optimize CI config

.gitlab-ci.yml

 before_script:
   - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
 
-node-8:
+node:
   stage: build
+  parallel:
+    matrix:
+      - VERSION: ['8-jessie-slim','10-jessie-slim','12-stretch-slim','13-stretch-slim']
   script:
-    - docker build --pull --build-arg NODE_VERSION=8-jessie-slim -t $CI_REGISTRY_IMAGE:8-jessie-slim .
-    - docker push $CI_REGISTRY_IMAGE:8-jessie-slim
-  only:
-    - master
-
-node-10:
-  stage: build
-  script:
-    - docker build --pull --build-arg NODE_VERSION=10-jessie-slim -t $CI_REGISTRY_IMAGE:10-jessie-slim .
-    - docker push $CI_REGISTRY_IMAGE:10-jessie-slim
-  only:
-    - master
-
-node-12:
-  stage: build
-  script:
-    - docker build --pull --build-arg NODE_VERSION=12-stretch-slim -t $CI_REGISTRY_IMAGE:12-stretch-slim .
-    - docker push $CI_REGISTRY_IMAGE:12-stretch-slim
-  only:
-    - master
-
-node-13:
-  stage: build
-  script:
-    - docker build --pull --build-arg NODE_VERSION=13-stretch-slim -t $CI_REGISTRY_IMAGE:13-stretch-slim .
-    - docker push $CI_REGISTRY_IMAGE:13-stretch-slim
+    - docker build --pull --build-arg NODE_VERSION=${VERSION} -t $CI_REGISTRY_IMAGE:${VERSION} .
+    - docker push $CI_REGISTRY_IMAGE:${VERSION}
   only:
     - master

Dockerfile

@@ -7,7 +7,7 @@ LABEL com.example.vendor="LakeDrops" \
       description="Node container with build tools included."
 
 RUN apt-get update -y && \
-    apt-get install -y -q python3 make g++ && \
+    apt-get install -y -q python3 make g++ curl && \
     ln -s python3 /usr/bin/python && \
     \
     apt-get clean && \