Add new build option and refactor CI to test changes

[leborchuk]

Here I added new build option TEA_BUILD_EXT.

Option should be enabled for adb-based distributions and disabled for open-gpdb based. But current CI does not enable easily test it.

So to build binaries and check code I made refactoring in CI. Goals was to speed up tests and use traditional pg_regress approach for check if database works as expected. Detailed list of changes:

1. A new option for building tea without support EXT tables TEA_BUILD_EXT. By default is ON for adb and OFF for open-gpdb.

2. Add pg_regress tests where I check if working with tea + fdw and tea + ext tables works as expected (using traditional approach with executing sql and compare them with expected output). Create simple extension Makefile to do it. Tests will fail if we enable TEA_BUILD_EXT in open-gpdb without fixing CI too.

3. Add Summary report, logging errors and downloading them to github actions - for better debugging.

4. Launch all checks inside pre-defined container ghcr.io/lithium-tech/tea-build:ubuntu22.04-latest - no need to install dependencies and compile additional components like arrow && grpc.

[Copilot]

Pull request overview

This PR updates the build/test pipeline to run inside a prebuilt container image, adds a CMake toggle to build Tea without external-table (custom protocol) support, and introduces a PGXS pg_regress installcheck suite to validate the extension behavior in CI.

Changes:

• Add TEA_BUILD_EXT option and conditionally compile/install Tea external-table protocol pieces.
• Add a PGXS Makefile + pg_regress test (tea_extension) and a CI runner script to stage under gpdb/gpcontrib.
• Move build/smoke/REST GitHub Actions jobs into the container image and upload logs/results artifacts for debugging.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
CMakeLists.txt	Introduces TEA_BUILD_EXT CMake option to toggle external-table support.
tea/gpext/CMakeLists.txt	Conditionally compiles external-table sources only when TEA_BUILD_EXT is enabled.
extension/CMakeLists.txt	Conditionally injects external-table SQL (and metrics SQL) into generated extension scripts based on TEA_BUILD_EXT.
extension/Makefile	Adds PGXS installcheck harness for running pg_regress in CI.
extension/sql/tea_extension.sql	Adds pg_regress SQL verifying extension presence, FDW path, and expected behavior when external tables are disabled.
extension/expected/tea_extension.out	Adds expected output for the new tea_extension pg_regress test.
ci/run-pg-regress.sh	Stages repo under gpdb/gpcontrib/tea and runs make installcheck, collecting logs/results.
ci/build-tea.sh	Builds Tea in CI with TEA_BUILD_EXT=OFF.
ci/build-gpdb.sh	Keeps the gpdb source directory (needed later for staging pg_regress).
.github/workflows/build.yml	Runs build/tests in the container, runs pg_regress, and uploads logs/results artifacts.
.github/workflows/smoke-tests.yml	Runs smoke tests in the container and uploads logs/results/regression artifacts.
.github/workflows/ci.yml	Adds permissions/concurrency, moves relevant jobs into the container approach, and uploads REST logs/artifacts.

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