Add GO_TEST_EXEC variable to use gotestsum on CI

[pose]

Fixes #2106.

Context

We previously used gotestfmt to improve test output readability on CI, but it was removed because it was mis-attributing logs from one test to another and not reporting logs when a panic was encountered — making failures harder to diagnose rather than easier.

gotestsum is a more robust alternative. This PR introduces two Makefile variables:

• GO_TEST_EXEC ?= go test — set to "gotestsum --format github-actions --" on CI via the workflow env: block
• TESTTAGS ?= all — overridden per-language in the non-shorted matrix path

Why the workflow had to change too

An earlier attempt set GO_TEST_EXEC in the workflow env and relied on Make's ?= to pick it up. This worked for the sharded path (which calls make test), but not the non-sharded path, which called go test directly in the workflow YAML — bypassing the Makefile entirely. awsx uses the non-sharded path, so GO_TEST_EXEC was never consulted.

This change moves all test invocations through make so GO_TEST_EXEC is always honoured, and also aligns with the strategic goal of keeping workflows "dumb" — test logic lives in the Makefile, not scattered across workflow YAML.

Changes

• Add GO_TEST_EXEC ?= go test and TESTTAGS ?= all to both base and parameterized-go Makefile templates
• Use $(GO_TEST_EXEC) and $(TESTTAGS) in test and test_provider make targets
• Set GO_TEST_EXEC: "gotestsum --format github-actions --" in the test workflow's global env:
• Replace non-sharded go test workflow steps with make TESTTAGS=<language> GOTESTARGS=<flags> test
• Add gotestsum via aqua to mise.test.toml so it is installed in test workflow environments

Test plan

• make test-go test-providers passes — all 15 test providers regenerate and pass actionlint
• Verify gotestsum output on a real provider CI run — sample run: Update GitHub Actions workflows. pulumi-awsx#1907
  • Works like a charm!

🤖 Generated with Claude Code

[corymhall]

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