only release from branch main or master

only release from branch main or master

only mirror main or master branch

documentation

pin used Ubuntu image

migrate build system to earthly

Merge pull request #450 from mathisdt/dependabot/maven/com.google.gua…

…va-guava-33.4.6-jre

build(deps): bump com.google.guava:guava from 33.4.5-jre to 33.4.6-jre

update to Guava 33.4.5

update to ical4j 4.1.0

Merge pull request #419 from mathisdt/dependabot/maven/com.google.gua…

…va-guava-33.4.0-jre

build(deps): bump com.google.guava:guava from 33.3.1-jre to 33.4.0-jre