Remove old release dir and process steps

Releases happen according to steps mentioned in release/README.md

Change-Id: Ie4d608da477592fd5353d3a894164ee988b1d663
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/31800
Cloud-Build: GCB Service account <228075978874@cloudbuild.gserviceaccount.com>
Reviewed-by: Rayan Dasoriya <dasoriya@google.com>
Tested-by: Arnav Kansal <rnv@google.com>
diff --git a/src/cmd/cos_gpu_installer/README.md b/src/cmd/cos_gpu_installer/README.md
index ac56467..d04945b 100644
--- a/src/cmd/cos_gpu_installer/README.md
+++ b/src/cmd/cos_gpu_installer/README.md
@@ -24,14 +24,6 @@
 /usr/bin/docker run --rm "gcr.io/cos-cloud/cos-gpu-installer:v2" help
 ```
 
-## Build and Release
-Run the following script to build a cos\_gpu\_installer container image through
-Google Cloud Build and save the image to GCR:
-
-```
-src/cmd/cos_gpu_installer/release/build_and_release.sh <GCR-project> <image-tag>
-```
-
 ## Test
 
 ### Source code
diff --git a/src/cmd/cos_gpu_installer/release/Dockerfile b/src/cmd/cos_gpu_installer/release/Dockerfile
deleted file mode 100644
index ed96f29..0000000
--- a/src/cmd/cos_gpu_installer/release/Dockerfile
+++ /dev/null
@@ -1,16 +0,0 @@
-# Dockerfile for the COS GPU Installer container.
-
-FROM debian:9
-LABEL maintainer="cos-containers@google.com"
-
-# Install minimal tools needed to build kernel modules.
-RUN apt-get update -qq && \
-    apt-get install -y xz-utils kmod git make bc curl ccache \
-    libc6-dev pciutils gcc libelf-dev libssl-dev bison flex keyutils python2.7-minimal && \
-    rm -rf /var/lib/apt/lists/* && \
-    # x86_64-cros-linux-gnu-clang depends on /usr/bin/python2
-    ln -s /usr/bin/python2.7 /usr/bin/python2
-
-COPY cos-gpu-installer /cos-gpu-installer
-ENTRYPOINT ["/cos-gpu-installer"]
-CMD ["install"]
diff --git a/src/cmd/cos_gpu_installer/release/build_and_release.sh b/src/cmd/cos_gpu_installer/release/build_and_release.sh
deleted file mode 100755
index 838b513..0000000
--- a/src/cmd/cos_gpu_installer/release/build_and_release.sh
+++ /dev/null
@@ -1,35 +0,0 @@
-#!/bin/bash
-#
-# Script to build and release cos-gpu-installer to GCR.
-#
-# Usage: ./build_and_release.sh <project_id> <tag>
-#
-# Example: ./build_and_release.sh cos-cloud v2.0.1
-
-set -o errexit
-set -o pipefail
-set -o nounset
-
-SCRIPTDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
-
-build() {
-  pushd "$(dirname "${SCRIPTDIR}")"
-  go build -o release/cos-gpu-installer main.go
-  popd
-}
-
-release() {
-  project_id="$1"
-  tag="$2"
-  pushd "${SCRIPTDIR}"
-  gcloud builds submit . --config cloud_build_request.yaml --substitutions _PROJECT_ID="${project_id}",TAG_NAME="${tag}"
-  rm cos-gpu-installer
-  popd
-}
-
-main() {
-  build
-  release "$@"
-}
-
-main "$@"
diff --git a/src/cmd/cos_gpu_installer/release/cloud_build_request.yaml b/src/cmd/cos_gpu_installer/release/cloud_build_request.yaml
deleted file mode 100644
index b5e55a2..0000000
--- a/src/cmd/cos_gpu_installer/release/cloud_build_request.yaml
+++ /dev/null
@@ -1,12 +0,0 @@
-# GCP Cloud Build request in YAML format.
-# See https://cloud.google.com/cloud-build/docs for details.
-
-steps:
-- name: 'gcr.io/cloud-builders/docker'
-  args:
-  - 'build'
-  - '-t'
-  - 'gcr.io/${_PROJECT_ID}/cos-gpu-installer:${TAG_NAME}'
-  - './'
-images:
-- 'gcr.io/${_PROJECT_ID}/cos-gpu-installer:${TAG_NAME}'