feat(stackable-versioned): Add ApplyResource trait

Author: NickLarsenNZ

crates/stackable-versioned/Cargo.toml

@@ -14,6 +14,8 @@ all-features = true
 full = ["k8s", "flux-converter"]
 k8s = [
   "stackable-versioned-macros/k8s", # Forward the k8s feature to the underlying macro crate
+  "dep:kube",
+  "dep:k8s-openapi",
 ]
 flux-converter = [
   "k8s",

crates/stackable-versioned/src/apply_resource.rs

@@ -0,0 +1,17 @@
+use k8s_openapi::Resource;
+use kube::Client;
+use serde::Serialize;
+
+/// Given a [kube::Client], apply a resource to the server.
+///
+/// This is esspecially useful when you have custom requirements for deploying
+/// CRDs to clusters which already have a definition.
+///
+/// For example, you want to prevent stable versions (v1) from having any
+/// change.
+pub trait ApplyResource: Resource + Serialize {
+    type Error;
+
+    /// Apply a resource to a cluster
+    fn apply(&self, kube_client: Client) -> Result<(), Self::Error>;
+}

crates/stackable-versioned/src/lib.rs

@@ -18,6 +18,9 @@ pub use stackable_versioned_macros::*;
 #[cfg(feature = "flux-converter")]
 mod flux_converter;
 
+#[cfg(feature = "k8s")]
+mod apply_resource;
+
 #[cfg(feature = "flux-converter")]
 pub use flux_converter::ConversionError;