add CfTurnstileSitekey context data to all captcha templates (go-gitea#31874)

In the OpenID flows, the "CfTurnstileSitekey" wasn't populated, which
caused those flows to fail if using Turnstile as the Captcha
implementation.

This adds the missing context variables, allowing Turnstile to be used
in the OpenID flows.

Author: bohde

routers/web/auth/linkaccount.go

@@ -40,6 +40,7 @@ func LinkAccount(ctx *context.Context) {
 	ctx.Data["HcaptchaSitekey"] = setting.Service.HcaptchaSitekey
 	ctx.Data["McaptchaSitekey"] = setting.Service.McaptchaSitekey
 	ctx.Data["McaptchaURL"] = setting.Service.McaptchaURL
+	ctx.Data["CfTurnstileSitekey"] = setting.Service.CfTurnstileSitekey
 	ctx.Data["DisableRegistration"] = setting.Service.DisableRegistration
 	ctx.Data["AllowOnlyInternalRegistration"] = setting.Service.AllowOnlyInternalRegistration
 	ctx.Data["ShowRegistrationButton"] = false
@@ -132,6 +133,7 @@ func LinkAccountPostSignIn(ctx *context.Context) {
 	ctx.Data["HcaptchaSitekey"] = setting.Service.HcaptchaSitekey
 	ctx.Data["McaptchaSitekey"] = setting.Service.McaptchaSitekey
 	ctx.Data["McaptchaURL"] = setting.Service.McaptchaURL
+	ctx.Data["CfTurnstileSitekey"] = setting.Service.CfTurnstileSitekey
 	ctx.Data["DisableRegistration"] = setting.Service.DisableRegistration
 	ctx.Data["ShowRegistrationButton"] = false
 
@@ -219,6 +221,7 @@ func LinkAccountPostRegister(ctx *context.Context) {
 	ctx.Data["HcaptchaSitekey"] = setting.Service.HcaptchaSitekey
 	ctx.Data["McaptchaSitekey"] = setting.Service.McaptchaSitekey
 	ctx.Data["McaptchaURL"] = setting.Service.McaptchaURL
+	ctx.Data["CfTurnstileSitekey"] = setting.Service.CfTurnstileSitekey
 	ctx.Data["DisableRegistration"] = setting.Service.DisableRegistration
 	ctx.Data["ShowRegistrationButton"] = false
 

routers/web/auth/openid.go

@@ -307,6 +307,7 @@ func RegisterOpenID(ctx *context.Context) {
 	ctx.Data["RecaptchaURL"] = setting.Service.RecaptchaURL
 	ctx.Data["McaptchaSitekey"] = setting.Service.McaptchaSitekey
 	ctx.Data["McaptchaURL"] = setting.Service.McaptchaURL
+	ctx.Data["CfTurnstileSitekey"] = setting.Service.CfTurnstileSitekey
 	ctx.Data["OpenID"] = oid
 	userName, _ := ctx.Session.Get("openid_determined_username").(string)
 	if userName != "" {