chore: add OpenSSF scorecard (#358)

Signed-off-by: Miguel Martinez Trivino <[email protected]>

Author: migmartri

README.md

@@ -1,5 +1,6 @@
 # Chainloop
 
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/chainloop-dev/chainloop/badge)](https://securityscorecards.dev/viewer/?uri=github.com/chainloop-dev/chainloop)
 [![Go Report Card](https://goreportcard.com/badge/github.com/chainloop-dev/chainloop)](https://goreportcard.com/report/github.com/chainloop-dev/chainloop)
 ![Test passing](https://github.com/chainloop-dev/chainloop/actions/workflows/test.yml/badge.svg?branch=main)
 [![Chat on Discord](https://img.shields.io/discord/1037381970189111326?logo=discord)](https://discord.gg/f7atkaZact)