I should got the answer...!

.github/workflows/ci-home.yml

@@ -26,9 +26,6 @@ jobs:
         os:
           - ubuntu-22.04
           - macos-13
-        home-manager-channel-ref:
-          - a8f8f48320c64bd4e3a266a850bbfde2c6fe3a04 # Pinned for current use
-          - master # unstable nixpkgs
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -37,7 +34,7 @@ jobs:
       - uses: actions/checkout@v3
       # https://www.reddit.com/r/Nix/comments/1443k3o/comment/jr9ht5g/?utm_source=reddit&utm_medium=web2x&context=3
       - run: mkdir -p ~/.local/state/nix/profiles
-      - run: nix run home-manager/${{ matrix.home-manager-channel-ref }} -- switch -b backup --flake .#github-actions
+      - run: nix run .#home-manager -- switch -b backup --flake .#github-actions
       - name: Print some paths and versions
         run: |
           which fish

flake.nix

@@ -73,6 +73,11 @@
         '';
 
         apps = {
+          # https://github.com/NixOS/nix/issues/6448#issuecomment-1132855605
+          home-manager = flake-utils.lib.mkApp {
+            drv = home-manager.defaultPackage.${system};
+          };
+
           # nix run .#json2nix
           json2nix = {
             type = "app";