* Make pullFixture a task dependency of resolveAllDependencies
With this change we will pull the docker test fixtures ( and thus cache
the images ) for older versions too as the `resolveAllDependencies` is
already being called on the bwc checkouts too.
The script is used to create a cache on ephemeral CI workers.
Changes:
- create and use a `pullFixture` task that always exists regardless
of docker support
- wire dependencies correctly so any pre fixture setup runs for pull
as well
- set up java env vars so bwc versions can build
With the introduction of immutable workers into our CI, we now have a
problem where we would have to download dependencies on every single
build. To this end our infrastructure team has introduced the
possibility to download dependencies one time and then bake these into
the base immutable worker image. For this, we introduce our version of
this special script which runs a task that downloads all dependencies of
all configurations. With this script, our infrastructure team will be
rebuilding these images on an at-least daily basis. This helps us avoid
having to download the dependencies for every single build.