ci: build demo builds in debug mode

[scotthart]

This change is 

[gemini-code-assist]

Summary of Changes

Hello @scotthart, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to enhance the debugging capabilities within the continuous integration (CI) demo environments. By configuring all demo builds to use the Debug build type, developers can obtain more detailed diagnostic information, such as symbols and unoptimized code, which is crucial for identifying and resolving issues. Additionally, an improvement to the gdb command ensures that comprehensive backtraces are collected when a quickstart program fails, further aiding in troubleshooting.

Highlights

• CI Build Type Change: The CMAKE_BUILD_TYPE has been switched from Release to Debug across all demo build configurations, including the main demo-install.sh script and various Dockerfiles for different Linux distributions. This change applies to the main project build and several third-party dependencies.
• GDB Command Update: The gdb command used in quickstart.sh for post-failure cleanup has been modified to use thread apply all bt instead of bt full, providing more comprehensive backtrace information for all threads.

Changelog

• ci/cloudbuild/builds/demo-install.sh
  • Updated the CMAKE_BUILD_TYPE from Release to Debug for the main project build.
• ci/cloudbuild/builds/lib/quickstart.sh
  • Modified the gdb command in the cleanup function to use thread apply all bt for more thorough backtrace collection.
• ci/cloudbuild/dockerfiles/demo-debian-bookworm.Dockerfile
  • Updated CMAKE_BUILD_TYPE to Debug for abseil-cpp, protobuf, opentelemetry-cpp, c-ares, re2, and grpc builds.
• ci/cloudbuild/dockerfiles/demo-debian-bullseye.Dockerfile
  • Updated CMAKE_BUILD_TYPE to Debug for abseil-cpp, protobuf, re2, grpc, and opentelemetry-cpp builds.
• ci/cloudbuild/dockerfiles/demo-rockylinux-9.Dockerfile
  • Updated CMAKE_BUILD_TYPE to Debug for abseil-cpp, protobuf, re2, grpc, json, and opentelemetry-cpp builds.
• ci/cloudbuild/dockerfiles/demo-ubuntu-24.04.Dockerfile
  • Updated CMAKE_BUILD_TYPE to Debug for abseil-cpp, protobuf, opentelemetry-cpp, c-ares, re2, and grpc builds.
• ci/cloudbuild/dockerfiles/demo-ubuntu-jammy.Dockerfile
  • Updated CMAKE_BUILD_TYPE to Debug for abseil-cpp, protobuf, grpc, json, and opentelemetry-cpp builds.
• doc/packaging.md
  • Updated CMAKE_BUILD_TYPE to Debug in various cmake commands for building google-cloud-cpp and its dependencies within the documentation.

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[gemini-code-assist]

Code Review

The pull request changes the CMAKE_BUILD_TYPE from Release to Debug across multiple CMake configurations in various build scripts and Dockerfiles. This change is consistent with the PR title and description, aiming to build demo builds in debug mode. Additionally, the quickstart.sh script has been updated to use thread apply all bt with gdb for core dump analysis, which is a more comprehensive command for debugging multithreaded applications.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.63%. Comparing base (c8a2a88) to head (62ff429).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15988   +/-   ##
=======================================
  Coverage   92.63%   92.63%           
=======================================
  Files        2334     2334           
  Lines      214633   214633           
=======================================
+ Hits       198822   198832   +10     
+ Misses      15811    15801   -10     

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