wasmtime: add pinned 36.x variant

Expose wasmtime_36 for packages that need the 36.x C API while keeping the default wasmtime on the current major.

pkgs/by-name/wa/wasmtime/package.nix

@@ -10,23 +10,40 @@
   nix-update-script,
   enableShared ? !stdenv.hostPlatform.isStatic,
   enableStatic ? stdenv.hostPlatform.isStatic,
+  majorVersion ? "45",
 }:
+let
+  sources = {
+    "36" = {
+      version = "36.0.11";
+      hash = "sha256-rrSI2dSOA8/1CL7JhW0eQ7LaeS5EqTVnyn2HTI+/x20=";
+      cargoHash = "sha256-S67/fv7179uDy4PpwycyXSWAknIC/7ZzvzWPOd6MD+8=";
+    };
+    "45" = {
+
+      version = "45.0.2";
+      hash = "sha256-LEQitwz+UDSX4mrjEecmoO/ZPgRnYTZ3DsD1pu8Jybs=";
+      cargoHash = "sha256-uTgEW2w0RSMetd2W1ucGiVMEEvz2A7CQ79SEsE8/+BM=";
+    };
+  };
+  source = sources.${majorVersion};
+in
 rustPlatform.buildRustPackage (finalAttrs: {
   pname = "wasmtime";
-  version = "45.0.2";
+  version = source.version;
 
   src = fetchFromGitHub {
     owner = "bytecodealliance";
     repo = "wasmtime";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-LEQitwz+UDSX4mrjEecmoO/ZPgRnYTZ3DsD1pu8Jybs=";
+    hash = source.hash;
     fetchSubmodules = true;
   };
 
   # Disable cargo-auditable until https://github.com/rust-secure-code/cargo-auditable/issues/124 is solved.
   auditable = false;
 
-  cargoHash = "sha256-uTgEW2w0RSMetd2W1ucGiVMEEvz2A7CQ79SEsE8/+BM=";
+  cargoHash = source.cargoHash;
   cargoBuildFlags = [
     "--package"
     "wasmtime-cli"

pkgs/by-name/wa/wasmtime_36/package.nix

@@ -0,0 +1,18 @@
+{
+  nix-update-script,
+  wasmtime,
+}:
+
+# NOTE: LTS Version EOL August 20 2027
+(wasmtime.override { majorVersion = "36"; }).overrideAttrs (old: {
+  __structuredAttrs = true;
+
+  passthru = old.passthru // {
+    updateScript = nix-update-script {
+      extraArgs = [
+        "--version-regex"
+        "^v(36\\.\\d+\\.\\d+)$"
+      ];
+    };
+  };
+})