Try out a more simple workflow.

.github/workflows/macos-test.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install devbox
         uses: djgoku/devbox-install-action@feature/add-support-for-macos-14
         with:
-          project-path: devbox/plugins/emacs/test
+          project-path: devbox/cowsay
           enable-cache: "true"
       # - name: test emacs early-init.el config
       #   run: devbox run -c devbox/plugins/emacs/test/ -- emacs --batch -l ../../emacs/early-init.el

devbox/cowsay/devbox.json

@@ -0,0 +1,14 @@
+{
+  "$schema":  "https://raw.githubusercontent.com/jetpack-io/devbox/0.10.3/.schema/devbox.schema.json",
+  "packages": ["cowsay@latest"],
+  "shell": {
+    "init_hook": [
+      "echo 'Welcome to devbox!' > /dev/null"
+    ],
+    "scripts": {
+      "test": [
+        "echo \"Error: no test specified\" && exit 1"
+      ]
+    }
+  }
+}

devbox/cowsay/devbox.lock

@@ -0,0 +1,73 @@
+{
+  "lockfile_version": "1",
+  "packages": {
+    "cowsay@latest": {
+      "last_modified": "2024-03-22T11:26:23Z",
+      "resolved": "github:NixOS/nixpkgs/a3ed7406349a9335cb4c2a71369b697cecd9d351#cowsay",
+      "source": "devbox-search",
+      "version": "3.7.0",
+      "systems": {
+        "aarch64-darwin": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/l1niykz16wdwm6xvgdlgv7c4sdfswl6z-cowsay-3.7.0",
+              "default": true
+            },
+            {
+              "name": "man",
+              "path": "/nix/store/r48xiikyyrv547qgsx27x176wyzgiyx9-cowsay-3.7.0-man",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/l1niykz16wdwm6xvgdlgv7c4sdfswl6z-cowsay-3.7.0"
+        },
+        "aarch64-linux": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/28y6pjsgl8i01miiwy8l1mmsxbzng4wx-cowsay-3.7.0",
+              "default": true
+            },
+            {
+              "name": "man",
+              "path": "/nix/store/zg3d24li47lslcljq18rgkq6d9f08la2-cowsay-3.7.0-man",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/28y6pjsgl8i01miiwy8l1mmsxbzng4wx-cowsay-3.7.0"
+        },
+        "x86_64-darwin": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/4vskmixzfh1j9r8ds2bnj7na10qldjzi-cowsay-3.7.0",
+              "default": true
+            },
+            {
+              "name": "man",
+              "path": "/nix/store/zd777rbd3s27p23hfpx014jg9wcj8vfc-cowsay-3.7.0-man",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/4vskmixzfh1j9r8ds2bnj7na10qldjzi-cowsay-3.7.0"
+        },
+        "x86_64-linux": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/0qfhxizh6l7mcf7xsqa3afc8q1g0ina0-cowsay-3.7.0",
+              "default": true
+            },
+            {
+              "name": "man",
+              "path": "/nix/store/041q1pgdvfndmmm78b4kfxlbmqlmhgb3-cowsay-3.7.0-man",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/0qfhxizh6l7mcf7xsqa3afc8q1g0ina0-cowsay-3.7.0"
+        }
+      }
+    }
+  }
+}