This commit makes the filtering applied during the archiving
configurable by introducing an optional `ArchiveFileFilter`
callback argument and a `SourceIgnoreFilter` implementation.
`SourceIgnoreFilter` filters out files matching
sourceignore.VCSPatterns and any of the provided patterns.
If an empty gitignore.Pattern slice is given, the matcher is set to
sourceignore.NewDefaultMatcher.
The `GitRepository` now loads the ignore patterns before archiving
the repository contents by calling `sourceignore.LoadIgnorePatterns`
and other helpers. The loading behavior is **breaking** as
`.sourceignore` files in the (subdirectories of the) repository are
now still taken into account if `spec.ignore` for a resource is
defined, overwriting is still possible by creating an overwriting
rule in the `spec.ignore` of the resource.
This change also makes it possible for the `BucketReconciler` to not
configure a callback at all and prevent looking for ignore
matches twice. To finalize the bucket refactor, a change to the
reconciler has been made to look for a `.sourceignore` file in
the root of the bucket to provide an additional way of configuring
(global) exclusions.
Signed-off-by: Hidde Beydals <hello@hidde.co>