feat(ci/cd): Set up Hydra

.hydra/jobsets.nix

@@ -0,0 +1,13 @@
+{ nixpkgs ? <nixpkgs> }:
+
+let
+
+  pkgs = import nixpkgs { };
+
+in
+
+{
+
+  myapp = pkgs.writeShellScript "hello" "${pkgs.hello}/bin/hello";
+
+}

.hydra/spec.json

@@ -0,0 +1,44 @@
+{
+  "enabled": 1,
+  "hidden": false,
+  "description": "ZSH flake",
+  "nixexprinput": "src",
+  "nixexprpath": ".hydra/jobsets.nix",
+  "checkinterval": 300,
+  "schedulingshares": 100,
+  "enableemail": false,
+  "enable_dynamic_run_command": false,
+  "emailoverride": "",
+  "keepnr": 3,
+  "inputs": {
+    "src": {
+      "type": "git",
+      "value": "git://forgejo.stefka.eu/jiriks74/zsh.nix.git main",
+      "emailresponsible": false 
+    },
+    "nixpkgs": { "type": "git",
+      "value": "git://github.com/NixOS/nixpkgs.git release-16.03",
+      "emailresponsible": false
+    },
+    "gitea_repo_name": {
+      "type": "string",
+      "value": "zsh.nix",
+      "emailresponsible": false
+    },
+    "gitea_repo_owner": {
+      "type": "string",
+      "value": "jiriks74",
+      "emailresponsible": false
+    },
+    "gitea_status_repo": {
+      "type": "string",
+      "value": "main",
+      "emailresponsible": false
+    },
+    "gitea_http_url": {
+      "type": "string",
+      "value": "https://forgejo.stefka.eu/",
+      "emailresponsible": false
+    }
+  }
+}