Issue in cosign documentation in README
Current cosign doc:
> Determines when images should be signed with [cosign](https://github.com/sigstore/cosign (never: disabled, onrelease: only on $INTEG_REF, $PROD_REF and $RELEASE_REF pipelines; always: any pipeline).
⚠️ cosign-enabled / DOCKER_COSIGN_ENABLED takes precedence
- Missing parenthesis for cosign URL.
- Reference to unused input/var cosign-enabled / DOCKER_COSIGN_ENABLED
issue