Add hydra spec files

.hydra/declarative-jobsets.nix

@@ -0,0 +1,53 @@
+{ nixpkgs, pulls, ... }:
+
+let
+  pkgs = import nixpkgs { };
+
+  prs = builtins.fromJSON (builtins.readFile pulls);
+  prJobsets = pkgs.lib.mapAttrs (num: info: {
+    enabled = 1;
+    hidden = false;
+    description = "PR ${num}: ${info.title}";
+    checkinterval = 300;
+    schedulingshares = 20;
+    enableemail = false;
+    emailoverride = "";
+    keepnr = 1;
+    type = 1;
+    flake = "${info.head.repo.html_url}/archive/${info.head.ref}.tar.gz";
+  }) prs;
+  mkFlakeJobset = branch: {
+    description = "Build ${branch} branch of the Malobeo Infrastructure repo";
+    checkinterval = 300;
+    enabled = "1";
+    schedulingshares = 100;
+    enableemail = false;
+    emailoverride = "";
+    keepnr = 3;
+    hidden = false;
+    type = 1;
+    flake = "git+https://git.dynamicdiscord.de/malobeo/infrastructure/archive/${branch}.tar.gz";
+  };
+
+  desc = prJobsets // {
+    "master" = mkFlakeJobset "master";
+  };
+
+  log = {
+    pulls = prs;
+    jobsets = desc;
+  };
+
+in
+{
+  jobsets = pkgs.runCommand "spec-jobsets.json" { } ''
+    cat >$out <<'EOF'
+    ${builtins.toJSON desc}
+    EOF
+    # This is to get nice .jobsets build logs on Hydra
+    cat >tmp <<'EOF'
+    ${builtins.toJSON log}
+    EOF
+    ${pkgs.jq}/bin/jq . tmp
+  '';
+}

.hydra/spec.json

@@ -0,0 +1,30 @@
+{
+  "enabled": 1,
+  "hidden": false,
+  "description": "Malobeo infrastructure repo",
+  "nixexprinput": "nixexpr",
+  "nixexprpath": ".hydra/declarative-jobsets.nix",
+  "checkinterval": 60,
+  "schedulingshares": 100,
+  "enableemail": false,
+  "emailoverride": "",
+  "keepnr": 5,
+  "type": 0,
+  "inputs": {
+    "nixexpr": {
+      "value": "https://git.dynamicdiscord.de/ahtlon/infrastructure master",
+      "type": "git",
+      "emailresponsible": false
+    },
+    "nixpkgs": {
+      "value": "https://github.com/NixOS/nixpkgs nixos-25.11",
+      "type": "git",
+      "emailresponsible": false
+    },
+    "pulls": {
+      "type": "path",
+      "value": "http://127.0.0.1:27364/gitea-pulls-sorted.json",
+      "emailresponsible": false
+    }
+  }
+}