Add support for provisioning and rebuilding via interface

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

@@ -6,6 +6,7 @@ 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"
 )
@@ -22,7 +23,18 @@ var instanceProvisionTemplate = templating.Parse[instanceProvisionContext](
 type instanceProvisionContext struct {
 	templating.RuntimeFlags
 
-	// nothing for the moment
+	systemParams
+}
+
+type systemParams struct {
+	PHPVersions       []string
+	DefaultPHPVersion string
+}
+
+func newSystemParams() (sp systemParams) {
+	sp.PHPVersions = models.KnownPHPVersions()
+	sp.DefaultPHPVersion = models.DefaultPHPVersion
+	return sp
 }
 
 func (admin *Admin) instanceProvision(ctx context.Context) http.Handler {
@@ -37,6 +49,7 @@ func (admin *Admin) instanceProvision(ctx context.Context) http.Handler {
 	)
 
 	return tpl.HTMLHandler(func(r *http.Request) (ipc instanceProvisionContext, err error) {
+		ipc.systemParams = newSystemParams()
 		return ipc, nil
 	})
 }