Bump plugin-site-issues docker image version to v0.3.0

[jenkins-infra-updatecli]

Bump `plugin-site-issues` docker image and helm chart versions

Update rating helm chart

Chart version updated to 0.2.1 key "$.version" updated from "0.2.0" to "0.2.1", in file "charts/plugin-site-issues/Chart.yaml"

v0.3.0

Release published on the 2022-04-15 02:34:10 +0000 UTC at the url https://github.com/jenkins-infra/docker-plugin-site-issues/releases/tag/v0.3.0

Fix markdown parsing for releases

* A bunch of internal refactoring, eg removing ava-nock which never quite worked right
* Some pipeline chores to support building with checks on ci.jenkins.io

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