$tag_filter is a variable not a directory. The check should be -n not
-d.

Current git resource is only watch tags name but not tags update. So
pipelines aren't triggered when the tag is updated and the resource

with `error: pathspec 'DEV' did not match any file(s) known to git.`
To solve it I suggest to not use only ref but ref and commit when
tag_filter is used.
This commit allow to store the tag name and commit id associeted to

tag as "version" of the resource. With thos way we are able to
re-trigger the pipeline when a the tags is updated.

Add --force option on git tag in order to be able to update existing
tag.
It help to test the filter_tags code by validating a changes on the
tag commit.

When no branch are specified it clone master. We dont need to get all
branches, so we can use --single-branch as previously even if no branch
are specified.

--list is only required once

Suggested by vito: use jq just in case someone has funny tag names.
Use lowercase variables