feat(john-endesktop): add harmonia binary cache service

Replace broken k8s harmonia deployment with native NixOS service.

Configuration:
- services.harmonia.enable = true
- Bind to [::]:5000 (IPv4 and IPv6)
- Sign key at /etc/harmonia/signing-key.private
- Open firewall port 5000

The signing key must be placed manually on john-endesktop at
/etc/harmonia/signing-key.private using the key generated earlier.

Closes: x-fqaob

.gitea/workflows/ci.yml

@@ -18,3 +18,50 @@ jobs:
         run: nix flake check
         env:
           NIX_CONFIG: "access-tokens = git.johnogle.info=${{ secrets.GITEA_ACCESS_TOKEN }}"
+
+  build-and-cache:
+    runs-on: ubuntu-latest
+    needs: check
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    strategy:
+      fail-fast: false
+      matrix:
+        machine:
+          - nix-book
+          - boxy
+          - zix790prors
+          - nix-deck
+          - john-endesktop
+          - live-usb
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: https://git.johnogle.info/johno/gitea-actions/nix-setup@v1
+
+      - name: Build ${{ matrix.machine }}
+        id: build
+        run: |
+          OUT_PATH=$(nix build .#nixosConfigurations.${{ matrix.machine }}.config.system.build.toplevel --no-link --print-out-paths)
+          echo "out_path=$OUT_PATH" >> "$GITHUB_OUTPUT"
+        env:
+          NIX_CONFIG: "access-tokens = git.johnogle.info=${{ secrets.GITEA_ACCESS_TOKEN }}"
+
+      - name: Sign and push to cache
+        run: |
+          # Write signing key
+          echo "${{ secrets.NIX_SIGNING_KEY }}" > /tmp/signing-key
+          chmod 600 /tmp/signing-key
+
+          # Sign the closure
+          nix store sign --key-file /tmp/signing-key -r "${{ steps.build.outputs.out_path }}"
+
+          # Setup SSH key for cache push
+          mkdir -p ~/.ssh
+          echo "${{ secrets.CACHE_SSH_KEY }}" > ~/.ssh/cache_key
+          chmod 600 ~/.ssh/cache_key
+          ssh-keyscan -H ${{ secrets.CACHE_HOST }} >> ~/.ssh/known_hosts 2>/dev/null || true
+
+          # Push to cache
+          nix copy --to "ssh-ng://${{ secrets.CACHE_USER }}@${{ secrets.CACHE_HOST }}?ssh-key=$HOME/.ssh/cache_key" "${{ steps.build.outputs.out_path }}"
+        env:
+          NIX_CONFIG: "access-tokens = git.johnogle.info=${{ secrets.GITEA_ACCESS_TOKEN }}"

flake.lock

@@ -258,6 +258,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-qt": {
+      "locked": {
+        "lastModified": 1770464364,
+        "narHash": "sha256-z5NJPSBwsLf/OfD8WTmh79tlSU8XgIbwmk6qB1/TFzY=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "23d72dabcb3b12469f57b37170fcbc1789bd7457",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-unstable": {
       "locked": {
         "lastModified": 1769170682,
@@ -347,6 +363,7 @@
         "nix-darwin": "nix-darwin",
         "nix-doom-emacs-unstraightened": "nix-doom-emacs-unstraightened",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-qt": "nixpkgs-qt",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "perles": "perles",
         "plasma-manager": "plasma-manager",

flake.nix

@@ -4,6 +4,9 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
     nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
+    # Separate nixpkgs for qt5webengine-dependent packages (jellyfin-media-player, etc.)
+    # Updates on separate Renovate schedule to avoid massive qt rebuilds
+    nixpkgs-qt.url = "github:nixos/nixpkgs/nixos-25.11";
 
     nix-darwin = {
       url = "github:nix-darwin/nix-darwin/nix-darwin-25.11";
@@ -76,6 +79,11 @@
         config.allowUnfree = true;
         overlays = unstableOverlays;
       };
+      # Separate nixpkgs for qt5webengine-heavy packages to avoid rebuild churn
+      qt-pinned = import inputs.nixpkgs-qt {
+        system = prev.stdenv.hostPlatform.system;
+        config.allowUnfree = true;
+      };
       custom = prev.callPackage ./packages {};
       # Compatibility: bitwarden renamed to bitwarden-desktop in unstable
       bitwarden-desktop = prev.bitwarden-desktop or prev.bitwarden;

machines/john-endesktop/configuration.nix

@@ -54,6 +54,7 @@ with lib;
       4000  # nfs callback
       4001  # nlockmgr
       4002  # mountd
+      5000  # harmonia binary cache
       20048 # mountd
     ];
     allowedUDPPorts = [
@@ -148,6 +149,16 @@ with lib;
     };
   };
 
+  # Harmonia binary cache server
+  # Replaces the broken k8s deployment with native NixOS service
+  services.harmonia = {
+    enable = true;
+    signKeyPath = "/etc/harmonia/signing-key.private";
+    settings = {
+      bind = "[::]:5000";
+    };
+  };
+
   # Time zone
   time.timeZone = "America/Los_Angeles"; # Adjust as needed
 

renovate.json

@@ -13,7 +13,7 @@
   "lockFileMaintenance": {
     "enabled": true,
     "schedule": [
-      "before 5am on monday"
+      "after 2pm and before 4pm on Saturday"
     ]
   },
   "dependencyDashboard": true,
@@ -37,6 +37,9 @@
         "/^nixpkgs$/",
         "/^home-manager$/",
         "/^nix-darwin$/"
+      ],
+      "schedule": [
+        "after 2pm and before 4pm on Saturday"
       ]
     },
     {
@@ -48,6 +51,21 @@
       "matchPackageNames": [
         "/nixpkgs-unstable/",
         "/home-manager-unstable/"
+      ],
+      "schedule": [
+        "after 2pm and before 4pm on Saturday"
+      ]
+    },
+    {
+      "description": "nixpkgs-qt updates on Saturday (staggered from main ecosystem)",
+      "matchManagers": [
+        "nix"
+      ],
+      "matchPackageNames": [
+        "/nixpkgs-qt/"
+      ],
+      "schedule": [
+        "after 4pm and before 6pm on Saturday"
       ]
     },
     {

roles/common.nix

@@ -23,7 +23,13 @@
         max-jobs = "auto";
         trusted-users = [ "johno" ];
         substituters = [
+          "https://nix-cache.johnogle.info"
         ];
+        trusted-public-keys = [
+          "nix-cache.johnogle.info-1:G0ZGQwcSC4+4SDDFHZI/ZX3a6uFrs/5cjA5Jvaypj0I="
+        ];
+        fallback = true;
+        connect-timeout = 5;
       };
 
       gc = {

roles/kodi/default.nix

@@ -47,23 +47,23 @@ in
       if cfg.jellyfinScaleFactor != null
       then pkgs.symlinkJoin {
         name = "jellyfin-media-player-scaled";
-        paths = [ pkgs.jellyfin-media-player ];
+        paths = [ pkgs.qt-pinned.jellyfin-media-player ];
         nativeBuildInputs = [ pkgs.makeWrapper ];
         postBuild = ''
           mkdir -p $out/bin
           rm -f $out/bin/jellyfin-desktop
-          makeWrapper ${pkgs.jellyfin-media-player}/bin/jellyfin-desktop $out/bin/jellyfin-desktop \
+          makeWrapper ${pkgs.qt-pinned.jellyfin-media-player}/bin/jellyfin-desktop $out/bin/jellyfin-desktop \
             --add-flags "--tv --scale-factor ${toString cfg.jellyfinScaleFactor}"
 
           # Update .desktop file to include scale factor and TV mode arguments
           mkdir -p $out/share/applications
           rm -f $out/share/applications/org.jellyfin.JellyfinDesktop.desktop
-          substitute ${pkgs.jellyfin-media-player}/share/applications/org.jellyfin.JellyfinDesktop.desktop \
+          substitute ${pkgs.qt-pinned.jellyfin-media-player}/share/applications/org.jellyfin.JellyfinDesktop.desktop \
             $out/share/applications/org.jellyfin.JellyfinDesktop.desktop \
             --replace-fail "Exec=jellyfin-desktop" "Exec=jellyfin-desktop --tv --scale-factor ${toString cfg.jellyfinScaleFactor}"
         '';
       }
-      else pkgs.jellyfin-media-player;
+      else pkgs.qt-pinned.jellyfin-media-player;
   in mkIf cfg.enable
     {
       users.extraUsers.kodi = {