feat(11.1-05): add the walkthrough's admin controller, publish command and published_at migration

- make:admin-controller, make:command and make:migration output, finished:
  the Posts controller serves models.Post behind acme.blog.access_posts,
  WinterCMS-style form and list YAML embedded through pact.AdminAssets,
  blog:publish sets published_at by slug with a bound parameter
- the posts route lists published posts only, newest first
- Docker tests migrate an ICU pl-PL database, roll back published_at, serve
  the route and run blog:publish with a published and an opened database
- the page gains the admin controller, console command and added-column
  sections

docs/examples/blog/controllers/posts.go

@@ -0,0 +1,34 @@
+// Code generated by summer make. DO NOT EDIT.
+
+package controllers
+
+import (
+	"git.golem15.com/golem15/summercms/docs/examples/blog/models"
+	"git.golem15.com/golem15/summercms/modules/pact"
+)
+
+var (
+	_ pact.AdminController   = postsAdmin{}
+	_ pact.AdminRecordSource = postsAdmin{}
+	_ pact.AdminPermissioned = postsAdmin{}
+)
+
+// postsAdmin is the Go form of the Posts backend controller with the List
+// and Form behaviours.
+type postsAdmin struct{}
+
+func (postsAdmin) ID() string        { return "acme.blog.posts" }
+func (postsAdmin) ModelName() string { return "Post" }
+func (postsAdmin) ConfigDir() string { return "controllers/posts" }
+
+// NewRecord returns the model the generic admin handlers query and fill.
+func (postsAdmin) NewRecord() any { return &models.Post{} }
+
+// RequiredPermissions replaces $requiredPermissions: an administrator needs
+// this permission before any schema or record is served.
+func (postsAdmin) RequiredPermissions() []string {
+	return []string{"acme.blog.access_posts"}
+}
+
+// PostsController returns the acme.blog.posts admin controller.
+func PostsController() pact.AdminController { return postsAdmin{} }