Document Google Ambient Credentials, Add Timeout for Azure Access Token Generation, Add Env Variable Support

[irby]

• Documents how to configure ambient credentials in Google GKE to use with the command-cert-manager-issuer, including what security claims are required for Keyfactor Command auth.
• Add a 10 second timeout to generating Azure access token
• Adds env variable specification support, to allow custom environment variables such as the ability to specify HTTP proxies.

[Copilot]

Pull request overview

This PR adds documentation for configuring Google GKE ambient credentials and implements a timeout mechanism for Azure access token generation. The timeout prevents the Azure credential generation process from hanging indefinitely, improving reliability when Azure services are slow or unresponsive.

Key Changes:

• Added comprehensive documentation for configuring GKE workload identity with Keyfactor Command
• Implemented a 10-second timeout for Azure access token retrieval operations
• Added references to the new Google ambient credentials documentation in both the main README and documentation source

Reviewed changes

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

File	Description
internal/command/client.go	Added 10-second timeout context for Azure access token generation
docsource/content.md	Added link to new Google GKE workload identity documentation
docs/ambient-providers/google.md	New comprehensive guide for configuring GKE ambient credentials with Keyfactor Command
README.md	Added link to new Google GKE workload identity documentation

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[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

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