test(spanner): add Spanner test workflow for express release train

.github/workflows/spanner.yaml

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+# Copyright 2022 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: spanner
+jobs:
+  units:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        java: [21]
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-java@v5
+      with:
+        distribution: temurin
+        java-version: ${{matrix.java}}
+    - run: java -version
+    - run: tests/spanner/test-spanner.sh

tests/spanner/test-spanner.sh

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+#!/bin/bash
+set -e
+
+SPANNER_VERSION=$(awk '/<artifactId>google-cloud-spanner-bom<\/artifactId>/{f=1;next} /<version>/{if(f){print;exit}}' google-cloud-bom/pom.xml | sed -n 's/.*<version>\(.*\)<\/version>.*/\1/p')
+FIRST_PARTY_DEPENDENCIES_VERSION=$(awk '/<artifactId>first-party-dependencies<\/artifactId>/{f=1;next} /<version>/{if(f){print;exit}}' libraries-bom/pom.xml | sed -n 's/.*<version>\(.*\)<\/version>.*/\1/p')
+
+echo "google-cloud-spanner-bom version: $SPANNER_VERSION"
+echo "first-party-dependencies version: $FIRST_PARTY_DEPENDENCIES_VERSION"
+
+# Download spanner source code
+rm -rf java-spanner
+git clone --depth 1 --branch v${SPANNER_VERSION} -c advice.detachedHead=false https://github.com/googleapis/java-spanner.git
+
+# Update the version of sdk-platform-java-config in all pom.xml files
+for pom_file in $(find java-spanner -name "pom.xml"); do
+  if grep -q "<artifactId>sdk-platform-java-config</artifactId>" "$pom_file"; then
+    awk -v version="${FIRST_PARTY_DEPENDENCIES_VERSION}" '
+      /<artifactId>sdk-platform-java-config<\/artifactId>/ {
+        print
+        getline # Read the next line (which should be the version)
+        print "    <version>" version "</version>"
+        next
+      }
+      { print }
+    ' "$pom_file" > "$pom_file.tmp" && mv "$pom_file.tmp" "$pom_file"
+    echo "Updated: $pom_file"
+  fi
+done
+
+# Show the diffs
+echo "Changes after version updates:"
+(cd java-spanner && git add .)
+(cd java-spanner && git --no-pager diff --staged)
+
+# Clean up backup files
+find java-spanner -name "pom.xml.bak" -delete
+
+(cd java-spanner && JOB_TYPE=test .kokoro/build.sh)