Update release instructions to remove -debug (#646)

Leftover reference to the old `-debug` image and builds that we don't do
anymore.

Co-authored-by: XAMPPRocky <4464295+XAMPPRocky@users.noreply.github.com>

build/release/README.md

@@ -3,8 +3,8 @@
 Run `make` to submit the `cloudbuild.yaml` to [Google Cloud Build](https://cloud.google.com/build) and build the 
 release:
 
-* Linux, Windows and macOS executable for both release and debug.
-* Docker images for both release and debug.
+* arm64 Linux, Windows and macOS executables.
+* arm64 Linux Docker image.
 
 If you need to pass extra arguments to the `make` target, the target comes with an `$(ARGS)` parameter than can be
 used.
@@ -17,11 +17,8 @@ This `cloudbuild.yaml` assumes several things are set up in the project:
 ## Docker container repository
 
 There needs to be a docker container repository called `release` already created in your 
-project, and the release images will create the Docker images therein. The images will be tagged with both ${version} 
-and ${version}-debug where the version is the version stored in Cargo.toml.
-
-The ${version}-debug tagged version runs the debug binary of Quilkin, where the ${version} tag runs the production 
-release binary.
+project, and the release images will create the Docker images therein. The images will be tagged with ${version} 
+where the version is the version stored in Cargo.toml.
 
 To create this, run: `gcloud artifacts repositories create release --repository-format=docker --location=us`.