feat: new deployment provider - F5 Big-IP

Description

Add support for F5 Big-IP as a deployment provider for Certimate.

F5 Big-IP is a load-balancing appliance widely used in enterprise environments. This provider will automatically upload and deploy SSL certificates via the iControl REST API.

Two modes are proposed:

• certificate: upload only (certificate + private key)
• clientssl: upload + assign to an existing client-ssl profile

The provider should:

• Auto-generate a stable F5 object name from the certificate SAN (e.g. certimate_example_com)
• Support wildcard certificates (*. prefix stripped from the name)
• Allow configuration of the target partition (default: Common)
• Support username/password authentication with optional insecure connection toggle

Motivation

Currently, deploying a certificate issued by Certimate to F5 is a manual process (export, upload via UI, assign to profile). A native F5 deployment provider would:

1. Close the loop: issue → deploy becomes a single workflow
2. Reduce human error in certificate deployment
3. Enable automated certificate renewal with zero-touch F5 deployment
4. Support enterprise compliance requirements for certificate lifecycle automation

F5 holds a significant share of the ADC/load-balancer market, and adding this provider addresses a recurring request from enterprise users.

Miscellaneous

Reference implementation: PR #1349 already has a working implementation with:

• Go SDK client for the iControl REST API (pkg/sdk3rd/f5bigip/)
• Provider implementation with both upload and clientssl modes
• Unit tests
• UI credential and deployment forms
• English and Chinese i18n

Contribution

• I am interested in contributing a PR for this!