chore: dynamic hosts, builder targets

Make hosts read from directories, to limit manual changes
Rename vm-gitlab -> gitlab
A few reformatting and lint changes due to altered files
Create builder targets for Darwin builders

hosts/unstable/linode/postgres.nix

@@ -0,0 +1,58 @@
+{ config, pkgs, ... }:
+
+{
+  environment.systemPackages = [ pkgs.upgrade-pg-cluster ];
+
+  services.postgresql = {
+    enable = true;
+    package = pkgs.postgresql_15;
+    checkConfig = true;
+    ensureDatabases = [ "nextcloud" ];
+    #initialScript = pkgs.writeText "create-matrix-db.sql" ''
+    #	CREATE ROLE "matrix-synapse" WITH LOGIN;
+    #	CREATE DATABASE "synapse" WITH OWNER "matrix-synapse" TEMPLATE template0 LC_COLLATE = "C" LC_CTYPE = "C";
+    #	GRANT ALL PRIVILEGES ON DATABASE "synapse" TO "matrix-synapse";
+    #'';  # These are done manually in order to set the LC_COLLATE values properly
+    ensureUsers = [
+      {
+        name = "nextcloud";
+        ensureDBOwnership = true;
+      }
+    ];
+    settings = {
+      log_connections = true;
+      log_statement = "all";
+      logging_collector = true;
+      log_filename = "postgresql.log";
+    };
+    identMap = ''
+      root root postgres
+    '';
+  };
+
+  services.postgresqlBackup = {
+    enable = true;
+    databases = [ "nextcloud" ];
+  };
+
+  services.logrotate = {
+    enable = true;
+    settings = {
+      postgresBackup = {
+        enable = true;
+        files = "${config.services.postgresqlBackup.location}/*.gz";
+      };
+      postgresLog = {
+        enable = true;
+        files = "/var/lib/postgresql/*/log/*.log";
+        compress = true;
+        compresscmd = "${pkgs.xz}/bin/xz";
+      };
+    };
+  };
+
+  greg.backup.jobs.greg-postgresql-backup = {
+    src = config.services.postgresqlBackup.location;
+    dest = "linode-postgres";
+  };
+}