Build: Build without install with -B .

[Jguer]

Users expect -B . to just build without installing which was never implemented.

man pages indicate this as a title, which is a similar pattern to -S and -Q which can induce the error

Fixes #2332

[Copilot]

Pull Request Overview

This PR implements the build-only functionality for the -B flag, allowing users to build packages without installing them unless the -i/--install flag is explicitly provided. This addresses the expected behavior where -B . should only build packages without installing them.

• Adds logic to determine when to skip installation based on -B operation and absence of -i/--install flag
• Introduces SetInstallBuiltPackages method to control installation behavior in the installer
• Updates build operation handler to always call the install function (removing early return)

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/sync/sync.go	Adds installation control logic based on command arguments
pkg/sync/build/installer.go	Implements installBuiltPackages field and setter method
pkg/sync/build/installer_test.go	Adds comprehensive test for build-only functionality
local_install_test.go	Adds integration test for local build-only operation
cmd.go	Removes conditional check that prevented build operation execution
main.go	Updates version number
doc/yay.8	Updates documentation with git flags information
.devcontainer/	Updates development container configuration

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}