add README

Author: st3penta

README.md

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+# FOSDEM 2026 Build Sample
+
+Sample repository demonstrating policy-based validation using Conforma.
+
+## Workflows
+
+- **Release** (`release.yml`) - Builds, attests, validates, and releases to `:latest` on main branch pushes
+- **PR Build** (`pr-build.yml`) - Validates pull requests using a separate policy configuration
+
+Only images passing policy validation are promoted to production.