to run a new build, simply do the following steps:
- goto Actions
- select the workflow you want to build on the left
- chose "Run workflow"
- in "Tag of base image in DockerHub" enter the version tag (e.g. 1.2.3) of the base image you want to build
- optionally adjust the other settings
- click the green "Run workflow" button at the bottom
if you want to build an old major version, chose the correct branch before!