Update installer action to match the latest cli behavior

.github/workflows/test.yaml

@@ -35,7 +35,7 @@ jobs:
       - name: Install devbox
         uses: ./
         with:
-          devbox-version: 0.4.4
+          devbox-version: 0.5.5
           project-path: 'testdata'
 
   test-action-with-cache:

action.yml

@@ -37,6 +37,7 @@ runs:
           ~/.nix-profile
           /nix/store
           /nix/var/nix
+          ~/.local/state/nix
         key: ${{ runner.os }}-devbox-${{ hashFiles(format('{0}/devbox.json', inputs.project-path)) }}
 
     - name: Get devbox version
@@ -109,4 +110,6 @@ runs:
       run: |
         NIX_INSTALLER_NO_CHANNEL_ADD=1
         NIX_BUILD_SHELL=/bin/bash
+        devbox setup nix
+        devbox install --config=${{ inputs.project-path }}
         devbox run --config=${{ inputs.project-path }} -- echo "Packages installed!"

testdata/devbox.json

@@ -1,11 +1,8 @@
 {
   "packages": [
-    "go"
+    "go@latest"
   ],
   "shell": {
     "init_hook": null
-  },
-  "nixpkgs": {
-    "commit": "52e3e80afff4b16ccb7c52e9f0f5220552f03d04"
   }
-}
+}