artifact download should handle single zip file

[jbolda]

Motivation

Previously through a muddle of examples, we expecting separate files but instead we had a single zip file which caused it to fail.

Approach

Handle downloading the zip file including the unzip, then handle each file separately.

[github-actions]

Package Changes Through c5c61cb

There are 9 changes which include covector with minor, @covector/apply with minor, @covector/assemble with minor, @covector/changelog with minor, @covector/files with minor, @covector/command with minor, @covector/toml with minor, @covector/types with minor, action with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
covector	0.11.0	0.12.0
@covector/apply	0.9.3	0.10.0
@covector/assemble	0.11.0	0.12.0
@covector/changelog	0.11.0	0.12.0
@covector/files	0.7.2	0.8.0
@covector/command	0.7.1	0.8.0
@covector/toml	0.1.0	0.2.0
@covector/types	0.0.0	0.1.0
action	0.11.0	0.12.0

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