chore(main): Store released artifacts in placer

.github/release-trigger.yml

@@ -0,0 +1,2 @@
+enabled: true
+multiScmName: google-api-go-client

internal/kokoro/release.sh

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+#!/bin/bash
+
+# Fail on any error.
+set -eo pipefail
+
+# Install zip
+apt install zip -y
+
+# Start the releasetool reporter
+requirementsFile=$(realpath $(dirname "$0"))/requirements.txt
+python3 -m pip install --require-hashes -r $requirementsFile
+python3 -m releasetool publish-reporter-script > /tmp/publisher-script; source /tmp/publisher-script
+
+# Move to the repository directory
+cd github/google-api-go-client/
+
+# Create a directory for storing the released artifact
+mkdir pkg && zip -r pkg/google-api-go-client.zip . -x 'pkg/*' @
+
+# Store the commit hash in a txt as an artifact.
+echo -e $KOKORO_GITHUB_COMMIT >> pkg/commit.txt

internal/kokoro/requirements.in

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+attrs==22.1.0
+cachetools==4.2.4
+certifi==2022.12.7
+cffi==1.15.1
+charset-normalizer==2.0.12
+click==8.0.4
+colorlog==6.7.0
+cryptography==39.0.1
+gcp-docuploader==0.6.3
+gcp-releasetool==1.10.5
+google-api-core==2.8.2
+google-auth==2.14.1
+google-cloud-core==2.3.1
+google-cloud-storage==2.0.0
+google-crc32c==1.3.0
+google-resumable-media==2.5.0
+googleapis-common-protos==1.56.3
+idna==3.4
+importlib-metadata==4.8.3
+jeepney==0.7.1
+Jinja2==3.0.3
+keyring==23.4.1
+MarkupSafe==2.0.1
+packaging==21.3
+protobuf==3.19.5
+pyasn1==0.5.0
+pyasn1-modules==0.3.0
+pycparser==2.21
+PyJWT==2.4.0
+pyparsing==3.0.9
+pyperclip==1.8.2
+python-dateutil==2.8.2
+requests==2.27.1
+rsa==4.9
+SecretStorage==3.3.3
+six==1.16.0
+typing_extensions==4.1.1
+urllib3==1.26.12
+zipp==3.6.0