Embed the default policy in the binary

README.md

@@ -9,6 +9,7 @@ See the [Documentation](https://matrix-org.github.io/matrix-authentication-servi
 
 - [Install Rust and Cargo](https://www.rust-lang.org/learn/get-started)
 - [Install Node.js and npm](https://nodejs.org/)
+- [Install Open Policy Agent](https://www.openpolicyagent.org/docs/latest/#1-download-opa)
 - Clone this repository
 - Generate the frontend:
   ```sh
@@ -17,6 +18,14 @@ See the [Documentation](https://matrix-org.github.io/matrix-authentication-servi
   npm run build
   cd ../..
   ```
+- Build the Open Policy Agent policies
+  ```sh
+  cd crates/policy/policies
+  make
+  # OR, if you don't have `opa` installed and want to build through the OPA docker image
+  make DOCKER=1
+  cd ../../..
+  ```
 - Generate the sample config via `cargo run -- config generate > config.yaml`
 - Run the database migrations via `cargo run -- database migrate`
 - Run the server via `cargo run -- server -c config.yaml`