Testing: Testcontainers for Go

[florinutz]

Adds a self-contained Go integration-testing example under testing/testcontainers/go-pgx/, bringing Go to parity with the existing Java and Python Testcontainers examples.

Testcontainers for Go has no dedicated CrateDB module, so a small cratedb.go helper drives the core GenericContainer with the CrateDB OCI image, a single-node command line, and an HTTP wait strategy on port 4200. Tests connect over the PostgreSQL wire protocol with [pgx]. Unlike by-language/go-pgx, the suite needs no external CrateDB and no CI services: block — Testcontainers starts the database itself.

Test cases:

• shared container (TestMain) — query sys.summits over the shared connection
• per-test container — own throwaway CrateDB, torn down via t.Cleanup
• advanced types — ARRAY, OBJECT(DYNAMIC), GEO_POINT, TIMESTAMP WITH TIME ZONE
• HTTP endpoint — CrateDB's native /_sql REST interface on port 4200

Also includes a README, a Makefile, and a CI workflow (testing-testcontainers-go.yml: Go 1.26.x × CrateDB nightly, nightly cron).

Run locally (requires Docker):

cd testing/testcontainers/go-pgx && go test -v ./...

Closes #1770

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[amotl]

Excellent, thank you so much! Please also add a relevant item to .github/dependabot.yml when applicable.

[kneth]

LGTM (disclaimer: I don't know much about Golang)