chore(main): Added kokoro release job (#7788)

.github/release-trigger.yml

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+enabled: true
+multiScmName: google-cloud-go

internal/kokoro/release.sh

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+#!/bin/bash
+
+# Fail on any error.
+set -eo pipefail
+
+# Install jq
+apt install jq zip -y
+
+# Start the releasetool reporter
+requirementsFile=$(realpath $(dirname "$0"))/requirements.txt
+python3 -m pip install --require-hashes -r $requirementsFile
+python3 -m releasetool publish-reporter-script > /tmp/publisher-script; source /tmp/publisher-script
+
+cd github/google-cloud-go/
+
+# Create a directory for storing all the artifacts 
+mkdir pkg
+
+# Test prechecks
+if [ -z "${AUTORELEASE_PR}" ]
+then
+  echo "Need to provide URL to release PR via AUTORELEASE_PR environment variable"
+  exit 1
+fi
+
+# Extract the PR number from the AUTORELEASE_PR variable
+get_pr_number () {
+  echo "$(basename "$1")"
+}
+
+# Get the PR number 
+pr_number=$(get_pr_number $AUTORELEASE_PR)
+
+# Returns the list of modules released in the PR. 
+release_modules () {
+  echo $(curl -s https://api.github.com/repos/googleapis/google-cloud-go/pulls/$1/files | \
+  jq -r 'map(select(.filename == ".release-please-manifest-individual.json" or .filename == ".release-please-manifest-submodules.json") | .patch)[0]' | \
+  awk -v RS='\n' '/^[+]/{print substr($2,2, length($2)-3)}')
+}
+
+# Create a zip file for each released module and store it in the pkg/
+# directory to be used as an artifact
+release_modules $pr_number | while read -r module
+do
+  zip -rq "pkg/$module.zip" "$module" >/dev/null
+done
+
+# Store the commit hash in a txt as an artifact.
+echo -e $KOKORO_GITHUB_COMMIT >> pkg/commit.txt
+
+# Test!
+sample_pr_1="https://github.com/googleapis/google-cloud-go/pull/7687"
+sample_pr_2="https://github.com/googleapis/google-cloud-go/pull/7701"
+
+pr_number_1=$(get_pr_number $sample_pr_1)
+pr_number_2=$(get_pr_number $sample_pr_2)
+
+if [ "$pr_number_1" != "7687" ] ; then
+  echo "Error: Incorrect value from get_pr_number."
+  exit
+fi
+
+if [ "$(release_modules $pr_number_1)" != "aiplatform appengine compute contactcenterinsights container iap retail security workstations" ] ; then
+  echo "Error: Incorrect value from release_modules."
+  exit
+fi
+
+if [ "$(release_modules $pr_number_2)" != "bigquery" ] ; then
+  echo "Error: Incorrect value from release_modules."
+  exit
+fi

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