tests: migrations github action from travis

[oowl]

openresty/lua-nginx-module#2482

[Copilot]

Pull request overview

This PR migrates the project’s CI from Travis CI to GitHub Actions by removing the Travis configuration and adding an equivalent Build/Test workflow under .github/workflows.

Changes:

• Removed the legacy Travis CI pipeline (.travis.yml).
• Added a GitHub Actions workflow that installs dependencies, builds LuaJIT + nginx, and runs the Perl test suite.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.travis.yml	Removes the old Travis CI build/test pipeline.
.github/workflows/build_and_test.yml	Adds a GitHub Actions workflow intended to replicate the previous build + test behavior on Ubuntu runners.

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