fix: add head sha output to action.yml

fix: add head sha output to action.yml

Merge pull request peter-evans#915 from peter-evans/missing-outputs

fix: add missing outputs

Merge pull request peter-evans#837 from peter-evans/proxy-support

feat: add support for https_proxy env var

Merge pull request peter-evans#829 from peter-evans/logging

fix: improve logging

feat: add deprecation warning

Merge pull request peter-evans#804 from peter-evans/gpg-sign-fix

fix: remove unnecessary gpg-sign input

Merge pull request peter-evans#795 from peter-evans/gpg-sign

feat: add input to enable gpg commit signing

Merge pull request peter-evans#724 from peter-evans/fix-assignees

fix: use the correct assignees property

Merge pull request peter-evans#719 from peter-evans/add-to-lists

fix: add to labels and assignees instead of resetting