feat: initial terraform provider for artifactapi v0.0.1

Resources:
- artifactapi_remote: CRUD for remote proxy repositories
- artifactapi_virtual: CRUD for virtual (merged) repositories

Data sources:
- data.artifactapi_remote: read remote config
- data.artifactapi_virtual: read virtual config

Supports all 10 package types (generic, docker, helm, pypi, npm,
rpm, alpine, puppet, terraform, goproxy), allowlist/blocklist,
tag banning, quarantine, and terraform import.

main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+
+	"github.com/hashicorp/terraform-plugin-framework/providerserver"
+
+	"git.unkin.net/unkin/terraform-provider-artifactapi/internal/provider"
+)
+
+var version = "0.0.1"
+
+func main() {
+	var debug bool
+	flag.BoolVar(&debug, "debug", false, "enable debug mode")
+	flag.Parse()
+
+	opts := providerserver.ServeOpts{
+		Address: "git.unkin.net/unkin/artifactapi",
+		Debug:   debug,
+	}
+
+	if err := providerserver.Serve(context.Background(), provider.New(version), opts); err != nil {
+		log.Fatal(err)
+	}
+}