add shell.nix template

Author: NickLarsenNZ

template/shell.nix.j2

@@ -0,0 +1,52 @@
+let
+  self = import ./. {};
+  inherit (self) sources pkgs;
+
+  beku = pkgs.callPackage (sources."beku.py" + "/beku.nix") {};
+  cargoDependencySetOfCrate = crate: [ crate ] ++ pkgs.lib.concatMap cargoDependencySetOfCrate (crate.dependencies ++ crate.buildDependencies);
+  cargoDependencySet = pkgs.lib.unique (pkgs.lib.flatten (pkgs.lib.mapAttrsToList (crateName: crate: cargoDependencySetOfCrate crate.build) self.cargo.workspaceMembers));
+in pkgs.mkShell rec {
+  name = "{[ operator.name }]";
+
+  packages = with pkgs; [
+    ## cargo et-al
+    rustup # this breaks pkg-config if it is in the nativeBuildInputs
+
+    ## Extra dependencies for use in a pure env (nix-shell --pure)
+    ## These are mosuly useful for maintainers of this shell.nix
+    ## to ensure all the dependencies are caught.
+    # cacert
+    # vim nvim nano
+  ];
+
+  # derivation runtime dependencies
+  buildInputs = pkgs.lib.concatMap (crate: crate.buildInputs) cargoDependencySet ++ [ pkgs.libz ];
+  
+  # build time dependencies
+  nativeBuildInputs = pkgs.lib.concatMap (crate: crate.nativeBuildInputs) cargoDependencySet ++ (with pkgs; [
+    # specific to secret-operator but should be discovered via crate2nix, but
+    # otherwise, we could include an operator-specific nix import for any extras
+    pkg-config
+    clang 
+    openssl
+    protobuf
+    krb5 
+
+    git
+    yq-go
+    jq
+    kubectl
+    nix # this is impled, but needed in the pure env
+    kubernetes-helm
+    # tilt already defined in default.nix
+    docker
+    kind
+
+    kuttl
+    beku
+    which
+    gettext # for the proper envsubst
+  ]);
+
+  LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
+}