tests: Rewrite to drop k3d, use same setup as chainlink-cosmos

No more slow tests, broken networking and other issues!

integration-tests/README.md

@@ -1,7 +1,38 @@
 # Local k8s run
 
-See [there](../docs/integration-tests/README.md)
+Make sure to have `psql` installed locally. We use it to create a new database for each node.
 
-# Integration Tests
+Create a new network for containers (only needs to be done once). A custom network allows containers to DNS resolve each other using container names.
+
+```
+docker network create chainlink
+```
+
+Build a custom core image with starknet relayer bumped to some commit.
+
+```
+cd ../core
+go get github.com/smartcontractkit/chainlink-starknet/relayer@<MY COMMIT HERE>
+docker build . -t smartcontract/chainlink:starknet -f ./core/chainlink.Dockerfile
+```
+
+Compile contracts and gauntlet:
+
+```
+yarn build
+cd contracts
+scarb --profile release build
+```
+
+Run the tests!
+
+```
+cd integration-tests
+go test -count 1 -v -timeout 30m --run OCRBasic ./smoke
+```
+
+Cleanup is broken right now, so use `something.down.sh` scripts to teardown everything afterwards.
+
+# Old docs
 
 For more information, see the [Chainlink Starknet Documentation | Integration Tests](../docs/integration-tests).