feat: Update workflow to use docker bake

docker-bake.hcl

@@ -0,0 +1,15 @@
+variable "TAG_BASE" {}
+variable "RELEASE_VERSION" {}
+
+group "default" {
+  targets = ["lldap-controller"]
+}
+
+target "docker-metadata-action" {}
+
+target "lldap-controller" {
+  inherits = ["docker-metadata-action"]
+  context = "./"
+  dockerfile = "Dockerfile"
+  tags = [for tag in target.docker-metadata-action.tags : "${TAG_BASE}:${tag}"]
+}