Add Harbor

[orthlus]

Thanks for taking the time to suggest an addition to awesome-selfhosted!

Please fill out information below (all fields are mandatory unless noted otherwise):

# software name
name: "Harbor"
# URL of the software project's homepage
website_url: "https://goharbor.io/"
# URL where the full source code of the program can be downloaded
source_code_url: "https://github.com/goharbor/harbor"
# description of what the software does, shorter than 250 characters, sentence case
description: "cloud native image registry"
# list of license identifiers, see https://github.com/awesome-selfhosted/awesome-selfhosted-data/blob/master/licenses.yml for the full list of licenses
licenses:
  - Apache-2.0
# list of languages/platforms, see https://github.com/awesome-selfhosted/awesome-selfhosted-data/tree/master/platforms for the full list of platforms
platforms:
  - Go
  - Javascript
  - Docker
# list of tags (categories), see https://github.com/awesome-selfhosted/awesome-selfhosted-data/tree/master/tags for the full list of tags
tags:
  - Software Development - Project Management
# (optional, true/false, default false) whether the software depends on a third-party service outside the user's control
depends_3rdparty: false
# (optional) link to an interactive demo of the software
demo_url: "https://my.awesome.softwar.e/demo"
# (optional) link to a list of clients/addons/plugins/apps/bots... for the software
related_software_url: "https://my.awesome.softwar.e/apps"

To ensure your issue is dealt with swiftly, please check the following (check the boxes [x]):

• Submit one item per issue. This eases reviewing and speeds up inclusion.
• You have searched the repository for any relevant issues or PRs, including closed ones.
• Any software you are adding is not already listed at any of awesome-sysadmin, staticgen.com, staticsitegenerators.net, dbdb.io.
• Any software project you are adding to the list is actively maintained.
• Any software project you are adding was first released more than 4 months ago.
• Any software project you are adding has working installation instructions.