feat: support install.go()

[kemingy]

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[Copilot]

Pull Request Overview

This PR adds support for installing the Go programming language in the envd build system. The implementation follows the existing patterns established for other language installations like Rust and Julia.

• Introduces a new install.go() function to install Go with optional version specification
• Implements Go installation by downloading from official Go releases and extracting to /usr/local/go
• Refactors Rust constants to follow unexported naming conventions

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

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File	Description
pkg/lang/ir/v1/golang.go	New file implementing Go installation logic with download and extraction
pkg/lang/ir/v1/system.go	Adds "go" case to language compilation switch statements
pkg/lang/ir/v1/rust.go	Refactors exported constants to unexported following Go conventions
pkg/lang/ir/v1/interface.go	Adds public Golang() function to register Go language in the graph
pkg/lang/frontend/starlark/v1/install/install.go	Registers the install.go Starlark function and its implementation
pkg/lang/frontend/starlark/v1/install/const.go	Adds ruleGo constant for the install.go rule name
envd/api/v1/install.py	Adds Python API documentation for the go() installation function
e2e/language/testdata/golang/build.envd	Test configuration file for Go installation e2e test
e2e/language/other_test.go	Adds e2e test case for Go installation verification

Comments suppressed due to low confidence (1)

pkg/lang/ir/v1/system.go:191

• The 'go' case is missing in the non-DisableMergeOp code path (lines 180-192). When DisableMergeOp is false, Go installation will be silently skipped. Add a case for 'go' that calls lang = g.installGolang(root, language.Version) to match the implementation in the DisableMergeOp branch.

			lang = g.installRust(root, language.Version)
		}
		langs = append(langs, lang)

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[Copilot]

Pull Request Overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

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