ci: support new release project location (googleapis#12456)

Author: burkedavison

.kokoro/release.cfg

@@ -15,7 +15,7 @@ action {
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 
 # Use the trampoline script to run in docker.
-build_file: "elixir-google-api/.kokoro/trampoline.sh"
+build_file: "elixir-google-api/.kokoro/trampoline_release.sh"
 
 # Configure the docker image for kokoro-trampoline.
 env_vars: {

.kokoro/trampoline.sh renamed to .kokoro/trampoline_release.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 2018 Google Inc.
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,6 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 set -eo pipefail
 # Always run the cleanup script, regardless of the success of bouncing into
 # the container.
@@ -21,4 +22,13 @@ function cleanup() {
     echo "cleanup";
 }
 trap cleanup EXIT
-python3 "${KOKORO_GFILE_DIR}/trampoline_v1.py"
+
+$(dirname $0)/populate-secrets.sh # Secret Manager secrets.
+TRAMPOLINE_HOST=$(echo "${TRAMPOLINE_IMAGE}" | cut -d/ -f1)
+if [[ ! "${TRAMPOLINE_HOST}" =~ "gcr.io" ]]; then
+  # If you need to specify a host other than gcr.io, you have to run on an update version of gcloud.
+  echo "TRAMPOLINE_HOST: ${TRAMPOLINE_HOST}"
+  gcloud components update
+  gcloud auth configure-docker "${TRAMPOLINE_HOST}"
+fi
+python3 "${KOKORO_GFILE_DIR}/trampoline_release.py"