Fork PRs don't have access to secrets so the builds for these PRs was failing when trying to create a local image for use in the atests. The image name is publicly known so does not need to be stored as a secret.
Set up workflow_dispatch for releases which can be triggered from github.com
workflow_dispatch allows the workflow to be run from branches other than master - making future patch releases much simpler.
To prevent accidental release of the wrong branch, require users to provide the version number which is checked against version.txt.
Fix PR builds from forks
Set up workflow_dispatch for releases which can be triggered from github.com
Upgrade dependencycheck gradle plugin
Cleanup unused slack notification steps