Prepare for release 0.5.0

[javuto]

Prepare for release 0.5.0

[Copilot]

Pull request overview

This PR prepares the osctrl project for version 0.5.0 release by updating all version references from 0.4.9 to 0.5.0. The changes ensure consistency across the codebase by updating the central version constant, its test, API documentation, changelog header, and environment configuration. The version constant in pkg/version/version.go is imported and used throughout the codebase by various components (admin, api, cli, tls), so updating it in one place propagates to all consumers.

Changes:

• Updated version constant and test from 0.4.9 to 0.5.0
• Updated API specification version in osctrl-api.yaml
• Updated CHANGELOG header for 0.5.0 release
• Updated OSCTRL_VERSION environment variable in .env.example

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/version/version.go	Updated OsctrlVersion constant from "0.4.9" to "0.5.0"
pkg/version/version_test.go	Updated test assertion to expect "0.5.0" instead of "0.4.9"
osctrl-api.yaml	Updated API version from 0.4.9 to 0.5.0
CHANGELOG.md	Updated release header to reference 0.5.0
.env.example	Updated OSCTRL_VERSION environment variable to 0.5.0

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