Add APK curl

gitlabci/docker-hub.yml

@@ -5,6 +5,7 @@ docker-hub-build:
     - docker login -u "$DOCKER_HUB_USER" -p "$DOCKER_HUB_TOKEN" $DOCKER_HUB_REGISTRY
   script:
     - cd $CI_PROJECT_DIR
+    - apk add --no-cache curl
     - SQUID_VERSION=`curl -s http://www.squid-cache.org/Versions/v4/ | egrep -m 1 -oh squid-.*.tar.gz | cut -d '"' -f1`
     - docker build --build-arg SQUID_VERSION="$CI_COMMIT_BRANCH" --pull -t $CONTAINER_BUILD_NOPROD_NAME .
     - docker push $CONTAINER_BUILD_NOPROD_NAME