chore: Update release job configs (#214)

Author: dazuma

.kokoro/release.cfg

@@ -13,7 +13,7 @@ build_file: "functions-framework-ruby/.kokoro/trampoline_v2.sh"
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
   key: "TRAMPOLINE_IMAGE"
-  value: "us-central1-docker.pkg.dev/cloud-sdk-release-custom-pool/release-images/ruby-multi"
+  value: "us-central1-docker.pkg.dev/cloud-sdk-release-custom-pool/release-images/ruby-release"
 }
 
 env_vars: {
@@ -28,7 +28,7 @@ env_vars: {
 
 env_vars: {
   key: "SECRET_MANAGER_KEYS"
-  value: "releasetool-publish-reporter-app,releasetool-publish-reporter-googlecloudplatform-installation,releasetool-publish-reporter-pem,docuploader_service_account"
+  value: "releasetool-publish-reporter-app,releasetool-publish-reporter-googlecloudplatform-installation,releasetool-publish-reporter-pem"
 }
 
 # Pick up Rubygems key from internal keystore

.kokoro/release.sh

@@ -7,5 +7,4 @@ set -eo pipefail
 export GEM_HOME=$HOME/.gem
 export PATH=$GEM_HOME/bin:$PATH
 
-gem install --no-document toys
-toys release perform -v --reporter-org=googlecloudplatform --enable-docs < /dev/null
+toys release perform -v --reporter-org=googlecloudplatform < /dev/null