feat: use official docker image

gitlab-ci/docker_login.sh

-#!/bin/bash
-
-## Resilient docker login with multiple progressive retries in case of TLS issues
-
-function print_the_help {
-  echo "USAGE:  -u user -p -password [...] [registry]"
-  echo "ARGUMENTS:"
-  echo "          -u,--user       Registry user"
-  echo "          -p,--password   Registry password"
-  echo "          --ci            Login to internal CI registry; -u, -p and positional are ignored"
-  echo "          -t,--time       Time interval (in seconds) between attempts"
-  echo "                          (doubled each time), default: 5"
-  echo "          -n,--n-attempts Number of attempts, default: 5"
-  echo "          -h,--help       Print this message"
-  echo "  positional       Registry name (will use dockerhub if none given)"
-  echo ""
-  echo "  Login to registry."
-  echo ""
-  echo "EXAMPLE: ./docker_login.sh -u \$CI_REGISTRY_USER -p \$CI_REGISTRY_PASSWORD \$CI_REGISTRY" 
-  exit
-}
-
-REGISTRY=
-REG_USER=
-REG_PASSWORD=
-NTRIES=5
-TIME=5
-CI=
-
-while [ $# -gt 0 ]; do
-  key=$1
-  case $key in
-    -u|--user)
-      REG_USER=$2
-      shift
-      shift
-      ;;
-    -p|--password)
-      REG_PASSWORD=$2
-      shift
-      shift
-      ;;
-    --ci)
-      CI=1
-      shift
-      ;;
-    -t|--time)
-      TIME=$2
-      shift
-      shift
-      ;;
-    -n|--n-attempts)
-      NTRIES=$2
-      shift
-      shift
-      ;;
-    -h|--help)
-      print_the_help
-      exit 0
-      ;;
-    -*)
-      echo "ERROR: unknown flag: $key"
-      echo "use --help for more info"
-      exit 1
-      ;;
-    *)
-      REGISTRY+="$1"
-      shift
-      ;;
-  esac
-done
-
-## only sanizize input if not in CI registry mode
-if [ -z $CI ]; then
-  if [ -z $REG_USER ]; then
-    echo "ERROR: no username given, please use -u <USER>"
-    print_the_help
-    exit 1
-  fi
-  if [ -z $REG_PASSWORD ]; then
-    echo "ERROR: no password given, please use -p <PASSWORD>"
-    print_the_help
-    exit 1
-  fi
-else
-  REGISTRY=$CI_REGISTRY
-  REG_USER=$CI_REGISTRY_USER
-fi
-
-while [ $NTRIES != 0 ]; do
-  if [ -z $CI ]; then
-    echo $REG_PASSWORD | docker login -u $REG_USER \
-                                     --password-stdin $REGISTRY \
-      && break \
-      || echo "Login failed, retrying in $TIME seconds..."
-  else
-    echo $CI_REGISTRY_PASSWORD | docker login -u $REG_USER \
-                                              --password-stdin $REGISTRY \
-      && break \
-      || echo "Login failed, retrying in $TIME seconds..."
-  fi
-  sleep ${TIME}s
-  TIME=$((TIME * 2))
-  NTRIES=$((NTRIES - 1))
-done
-if [ $NTRIES = 0 ]; then
-  echo "Failed to login to registry $REGISTRY"
-  exit 1
-fi
-echo "Docker login to $REGISTRY successful"