Please provide a brief description of the changes proposed in this Pull Request
Remove references of $(REGISTRY) from Makefile
Use projects-stg as the hardcoded value for pushing images (including sig store components)
This is because in the CI yaml file we will pull and tag, so it is ok to hardcode here
Checklist
[ ] tested locally
[ ] updated any relevant dependencies
[ ] updated any relevant documentation or examples
Testing Done
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Issue
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Description
Please provide a brief description of the changes proposed in this Pull Request
$(REGISTRY)
from MakefileChecklist
Testing Done
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Issue
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Fixes #
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