Add TEST_SETUP_COMMANDS and CODE_GEN_COMMANDS inputs to Go CI actions

[dcbickfo]

Summary

Adds extensibility inputs to Go CI actions so consumers can inject custom commands at key pipeline stages:

• CODE_GEN_COMMANDS (in go/deps and go/build) — runs between buf generate and go mod tidy. For code generation tools like sqlc, wire, or ent that produce importable Go files needed before vendoring.
• TEST_SETUP_COMMANDS (in go/build-and-test) — runs between build and test steps. For DB migrations, seed data, config generation, or other pre-test setup.
• PARALLEL and MOCKERY_INSTALL_VERSION — pass-through inputs in go/build-and-test that were already supported by sub-actions but not surfaced in the combined action.

All inputs are optional with empty-string defaults — no breaking changes.

Users specify these as shell script bodies:

CODE_GEN_COMMANDS: |
  go install github.com/sqlc-dev/sqlc/cmd/sqlc@latest
  sqlc generate

Also adds a composite actions reference table to the README documenting all available actions in this repo.

Validated on consuming repos (pre-rebase)

Repo	PR	CI	Staging Deploy
inventory-api (Go)	#15	pass	pass
geo-admin (Ruby)	#395	pass	pass

Files changed

File	Change
go/build-and-test/action.yml	Add TEST_SETUP_COMMANDS, CODE_GEN_COMMANDS, PARALLEL, MOCKERY_INSTALL_VERSION inputs
go/build/action.yml	Add CODE_GEN_COMMANDS, MOCKERY_INSTALL_VERSION inputs, pass through to go/deps
go/deps/action.yml	Add CODE_GEN_COMMANDS input, execute between buf generate and go mod tidy
README.md	Add composite actions reference table

Test plan

• inventory-api CI + staging deploy passes
• geo-admin CI + staging deploy passes (no-op validation — Ruby actions unchanged)
• Reviewer confirms no breaking changes to action interfaces

[Copilot]

Pull request overview

Adds optional extensibility inputs to the repo’s composite Go CI actions so consuming workflows can run custom commands at specific pipeline points (code generation between buf generate and go mod tidy, and test setup between build and test), plus surfaces previously-supported pass-through inputs.

Changes:

• Add CODE_GEN_COMMANDS to go/deps and pass it through from go/build and go/build-and-test.
• Add TEST_SETUP_COMMANDS to go/build-and-test to run custom setup between build and test.
• Surface PARALLEL and MOCKERY_INSTALL_VERSION in go/build-and-test and pass them to sub-actions.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
go/deps/action.yml	Adds CODE_GEN_COMMANDS input and executes it after buf generate.
go/build/action.yml	Adds MOCKERY_INSTALL_VERSION + CODE_GEN_COMMANDS inputs and passes them to go/deps.
go/build-and-test/action.yml	Adds TEST_SETUP_COMMANDS, PARALLEL, MOCKERY_INSTALL_VERSION, CODE_GEN_COMMANDS and wires them through to sub-steps/actions.
.gitignore	Ignores docs/ directory for local planning docs.

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