Unify instance_{rebuild,provision}.html

This commit unifies the templates for rebuild and provision as they are
nearly identical.

internal/dis/component/server/admin/instance_provision.go

@@ -6,43 +6,17 @@ import (
 
 	"github.com/FAU-CDI/wisski-distillery/internal/dis/component/server/assets"
 	"github.com/FAU-CDI/wisski-distillery/internal/dis/component/server/templating"
-	"github.com/FAU-CDI/wisski-distillery/internal/models"
 
 	_ "embed"
 )
 
-//go:embed "html/instance_provision.html"
-var instanceProvisionHTML []byte
-var instanceProvisionTemplate = templating.Parse[instanceProvisionContext](
-	"instance_provision.html", instanceProvisionHTML, nil,
-
-	templating.Title("Provision New Instance"),
-	templating.Assets(assets.AssetsAdminProvision),
-)
-
-type instanceProvisionContext struct {
-	templating.RuntimeFlags
-
-	systemParams
-}
-
-type systemParams struct {
-	PHPVersions             []string
-	ContentSecurityPolicies []string
-	DefaultPHPVersion       string
-}
-
-func newSystemParams() (sp systemParams) {
-	sp.PHPVersions = models.KnownPHPVersions()
-	sp.ContentSecurityPolicies = models.ContentSecurityPolicyExamples()
-	sp.DefaultPHPVersion = models.DefaultPHPVersion
-	return sp
-}
-
 func (admin *Admin) instanceProvision(ctx context.Context) http.Handler {
-	tpl := instanceProvisionTemplate.Prepare(
+	tpl := instanceSystemTemplate.Prepare(
 		admin.Dependencies.Templating,
 
+		templating.Title("Provision New Instance"),
+		templating.Assets(assets.AssetsAdminProvision),
+
 		templating.Crumbs(
 			menuAdmin,
 			menuInstances,
@@ -50,8 +24,8 @@ func (admin *Admin) instanceProvision(ctx context.Context) http.Handler {
 		),
 	)
 
-	return tpl.HTMLHandler(func(r *http.Request) (ipc instanceProvisionContext, err error) {
-		ipc.systemParams = newSystemParams()
+	return tpl.HTMLHandler(func(r *http.Request) (ipc instanceSystemContext, err error) {
+		ipc.prepare(false)
 		return ipc, nil
 	})
 }