Remove old CircleCI jobs

[lucacome]

Summary by CodeRabbit

Release Notes

• Chores
  • Removed legacy CI/CD pipeline configuration and associated build infrastructure scripts that are no longer actively maintained.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 75bd11f7-a636-45ec-8ac8-246c1388681e

📥 Commits

Reviewing files that changed from the base of the PR and between a6d7aa6 and 6376689.

📒 Files selected for processing (8)

• .circleci/config.yml
• ci/Dockerfile
• ci/build_nginx_opentracing_module.sh
• ci/do_ci.sh
• ci/install_gcc4.8.sh
• ci/install_opentracing.sh
• ci/run_nginx_ot_docker.sh
• ci/setup_build_environment.sh

💤 Files with no reviewable changes (8)

• .circleci/config.yml
• ci/do_ci.sh
• ci/setup_build_environment.sh
• ci/run_nginx_ot_docker.sh
• ci/Dockerfile
• ci/build_nginx_opentracing_module.sh
• ci/install_gcc4.8.sh
• ci/install_opentracing.sh

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Walkthrough

This pull request removes the complete CI/CD infrastructure for building and testing nginx with OpenTracing support, including the CircleCI workflow configuration and all supporting build automation scripts.

Changes

Cohort / File(s)	Summary
CI/CD Pipeline Configuration .circleci/config.yml	Removed CircleCI configuration containing two build jobs targeting Ubuntu 18.04 with different OpenTracing versions (v1.5.1 and v1.6.0) and the associated workflow definition.
Build and Setup Scripts ci/setup_build_environment.sh, ci/install_gcc4.8.sh, ci/install_opentracing.sh, ci/build_nginx_opentracing_module.sh, ci/do_ci.sh, ci/run_nginx_ot_docker.sh	Removed all build automation scripts that handled environment setup, GCC 4.8 installation, OpenTracing library compilation, nginx module building, and Docker container orchestration.
Docker Configuration ci/Dockerfile	Removed Dockerfile defining the ubuntu:24.04 based build environment with setup automation.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: removal of CircleCI configuration and related CI scripts, which includes the old CircleCI jobs (build_gcc48_opentracing_15/16) and supporting infrastructure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/circleci

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