SLSA Level 3 pipeline

What's Changed

• Complete pipeline by @zabdulre in #1
• Add draft release functionality by @zabdulre in #2
• Add fossa api key to artifacts env by @zabdulre in #3
• fix artifacts upload issue by @zabdulre in #4
• Push docker images by @zabdulre in #5
• Fix incorrect artifacts download path by @zabdulre in #6

New Contributors

• @zabdulre made their first contribution in #1

Full Changelog: https://github.com/PAIR-Systems-Inc/slsa/commits/v1.0.0