test(fix): add conformance test to the CI pipeline (redo of PR#1698).

.github/workflows/conformance.yaml

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+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+# Github action job to test core java library features on
+# downstream client libraries before they are released.
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+name: conformance
+jobs:
+  conformance:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/checkout@v3
+      with:
+        repository: googleapis/cloud-bigtable-clients-test
+        ref: main
+        path: cloud-bigtable-clients-test
+    - uses: actions/setup-java@v3
+      with:
+        distribution: zulu
+        java-version: 8
+    - uses: actions/setup-go@v3
+      with:
+        go-version: '>=1.20.2'
+    - run: java -version
+    - run: go version
+    - run: .kokoro/conformance.sh

.kokoro/conformance.sh

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+#!/bin/bash
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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
+
+## Get the directory of the build script
+scriptDir=$(realpath $(dirname "${BASH_SOURCE[0]}"))
+## cd to the parent directory, i.e. the root of the git repo
+cd ${scriptDir}/..
+
+# include common functions
+source ${scriptDir}/common.sh
+
+# Print out Maven & Java version
+mvn -version
+echo ${JOB_TYPE}
+
+# attempt to install 3 times with exponential backoff (starting with 10 seconds)
+retry_with_backoff 3 10 \
+  mvn install -B -V -ntp \
+    -DskipTests=true \
+    -Dclirr.skip=true \
+    -Denforcer.skip=true \
+    -Dmaven.javadoc.skip=true \
+    -Dgcloud.download.skip=true \
+    -T 1C
+
+RETURN_CODE=0
+set +e
+
+# Build and start the proxy in a separate process
+pushd .
+cd test-proxy
+mvn clean install -DskipTests
+nohup java -Dport=9999 -jar target/google-cloud-bigtable-test-proxy-0.0.1-SNAPSHOT.jar &
+proxyPID=$!
+popd
+
+# Run the conformance test
+pushd .
+cd cloud-bigtable-clients-test/tests
+eval "go test -v -skip `cat ../../test-proxy/known_failures.txt` -proxy_addr=:9999"
+RETURN_CODE=$?
+popd
+
+# Stop the proxy
+kill $proxyPID
+
+# fix output location of logs
+bash .kokoro/coerce_logs.sh
+
+echo "exiting with ${RETURN_CODE}"
+exit ${RETURN_CODE}

test-proxy/known_failures.txt

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+TestMutateRow_Generic_DeadlineExceeded\|TestMutateRows_Retry_ExponentialBackoff\|TestSampleRowKeys_Generic_DeadlineExceeded