add conformance tests github action config

.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
+    strategy:
+      matrix:
+        py-version: [ 3.7, 3.11 ]
+        use-legacy-client: [ "false", "true" ]
+    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-python@v4
+      with:
+        python-version: ${{ matrix.py-version }}
+    - uses: actions/setup-go@v4
+      with:
+        go-version: '>=1.20.2'
+    - run: chmod +x .kokoro/conformance.sh
+    - run: pip install -e .
+    - run: go version
+    - run: .kokoro/conformance.sh
+      name: "Conformance Tests"
+      env:
+        USE_LEGACY_CLIENT: ${{ matrix.use-legacy-client }}
+

.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
+
+## cd to the parent directory, i.e. the root of the git repo
+cd $(dirname $0)/..
+
+ARGS=""
+if [[ "$USE_LEGACY_CLIENT" == "true" ]]; then
+  ARGS="--legacy-client"
+  echo "Using legacy client"
+fi
+
+# Build and start the proxy in a separate process
+PROXY_PORT=9999
+pushd test_proxy
+nohup python testproxy --port $PROXY_PORT $ARGS &
+proxyPID=$!
+popd
+
+# Run the conformance test
+pushd .
+pwd
+ls
+cd cloud-bigtable-clients-test/tests
+eval "go test -v -proxy_addr=:$PROXY_PORT"
+RETURN_CODE=$?
+popd
+
+# Stop the proxy
+kill $proxyPID
+
+echo "exiting with ${RETURN_CODE}"
+exit ${RETURN_CODE}