feat: TLS support for web

[bonddim]

• Added TLS support for web
  • Added optional configurations cert_file and key_file to run web server with https
• Helm chart update
  • Refactored Ingress to use one host only (config.web.external_url is required)
  • Added Certificate resource template (secret is mounted to container into /app/certs/)
  • Added support for service with mixed protocols (exposes UI and Wireguard ports on same IP)
  • Added helm-docs target to makefile
  • Changed pod labels to use selectorLabels
  • Removed default probes (app runs without healthy web)
  • Removed sections from chart README
• Chart workflow update
  • Fix paths filters
  • Replaced helm/kind-action by nolar/setup-k3d-k3s

Resolves #240

[bonddim]

@h44z,
I've noticed that the app continues to run even when there is an error in the webSrv.Run goroutine. Is this the expected behavior, or could it be a bug?

Example on current master:

INFO[0000] Starting WireGuard Portal V2...              
INFO[0000] WireGuard Portal version: unknown (local build) 
DEBU[0000] WireGuard Portal Features:                   
DEBU[0000]   - EditableKeys: false                      
DEBU[0000]   - CreateDefaultPeerOnCreation: false       
DEBU[0000]   - SelfProvisioningAllowed: false           
DEBU[0000]   - ImportExisting: true                     
DEBU[0000]   - RestoreState: true                       
DEBU[0000]   - UseIpV6: true                            
DEBU[0000]   - CollectInterfaceData: true               
DEBU[0000]   - CollectPeerData: true                    
DEBU[0000]   - CollectAuditData: true                   
DEBU[0000] WireGuard Portal Settings:                   
DEBU[0000]   - ConfigStoragePath:                       
DEBU[0000]   - ExternalUrl: http://localhost:8888       
DEBU[0000] WireGuard Portal Authentication:             
DEBU[0000]   - OIDC Providers: 0                        
DEBU[0000]   - OAuth Providers: 0                       
DEBU[0000]   - Ldap Providers: 0                        
TRAC[0000] sysstat migration: <nil>                     
TRAC[0000] user migration: <nil>                        
TRAC[0000] interface migration: <nil>                   
TRAC[0000] peer migration: <nil>                        
TRAC[0000] peer status migration: <nil>                 
TRAC[0000] interface status migration: <nil>            
TRAC[0000] audit data migration: <nil>                  
TRAC[0000] skipping default user creation - admin user already exists 
INFO[0000] interface state restored                     
TRAC[0000] started ping checks                          
TRAC[0000] started interface data fetcher               
TRAC[0000] started peer data fetcher                    
INFO[0000] starting web service on :8888                
INFO[0000] web service on :8888 exited: listen tcp :8888: bind: address already in use 
DEBU[0000] web service shutting down, grace period: 5 seconds... 
DEBU[0000] web service shut down    

[h44z]

LGTM