use head_repository on workflow_run to determine fork

[jbolda]

Motivation

head_repository is the ticket for determining if the workflow_run is executing off a PR from a fork. This is based on context in #327.

[github-actions[bot]]

Package Changes Through 84ecd33d657e3b22b9311f03384a410091f4c6de

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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