Update addon_publishing.markdown

source/hassio/addon_publishing.markdown

@@ -9,4 +9,21 @@ sharing: true
 footer: true
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+At the end, all add-ons are simple docker container. You can use our build scripts for automate the hole process our you can build your own docker image and push it manual do a docker hub. Inside your addon `config.json` can you use:
+```json
+{
+  "image": "myhub/image-addon-name"
+}
+{
+  "image": "myhub/image-{arch}-addon-name"
+}
+```
+
+To specify from where it will load the addon by user installation. With `{arch}` inside image name, you can build your addon for multible architectures.
+
+
+## {% linkable_title Custom Add-ons %}
+
+You need a docker hub account. It is also possible to use our own docker registrator.
+
+## {% linkable_title Core Add-ons %}