feat: build single node binary

[torives]

🧪 How to test

Setup the database

The binary will start the graphql-server service and therefore needs a PostgreSQL instance to connect to. You should follow the instructions in the data crate README file to get a populated database you can interact with.

Build graphql-server

The cartesi-node command assumes the executables (graphql-server in this case) are present in the PATH variable. So you'll first need to build it with cargo and then add it to your PATH. For example:

Inside offchain/graphql-server:

cargo build

and then:

PATH="{path to your workspace}/rollups-node/offchain/target/debug:${PATH}" 

Run the cartesi-node command

From the project's root, just run:

POSTGRES_PASSWORD=pw go run ./cmd/cartesi-node full

The server should have started and to verify it you can interact with it via the GraphQL Playground at http://localhost:4000/graphql

Closes #91