Fix DEPLOY_UNFINISHED not being copied over to release

[tangrufus]

The tar generated by git archive doesn't include DEPLOY_UNFINISHED

trellis/roles/deploy/tasks/prepare.yml

Lines 29 to 39 in ab70d8e

	- name: Run git archive to populate new build dir
	shell: git archive {{ project_version }} | tar xf - -C {{ deploy_helper.new_release_path }}
	args:
	chdir: "{{ project_source_path }}"
	when: project.repo_subtree_path is not defined
	- name: Run git archive with subdirectory to populate new build dir
	shell: git archive {{ project_version }} {{ project.repo_subtree_path }} | tar -x --strip-components {{ project.repo_subtree_path.split('/') | count }} -f - -C {{ deploy_helper.new_release_path }}
	args:
	chdir: "{{ project_source_path }}"
	when: project.repo_subtree_path is defined

[swalkinshaw]

😱 nice catch

[tangrufus]

Should we tag this as a breaking change?

Before this PR, failed releases count towards deploy_keep_releases. Failed releases only being deleted when reaching deploy_keep_releases.

After this PR, a successful deploy removes all releases with DEPLOY_UNFINISHED during finalize.

The new behavior breaks how rollback.yml works currently.

[swalkinshaw]

It's technically breaking but it seems like it's correcting behaviour more than anything (behaviour which people probably didn't notice?)