fix(deploy): unblock Nixpacks builds via corepack and add CI guard

.github/workflows/nodejs.yml

@@ -47,3 +47,26 @@ jobs:
       - name: Build project
         run: yarn build
         if: ${{ github.event_name != 'pull_request' }}
+
+  nixpacks_build:
+    name: Validate Railway/Nixpacks build
+    runs-on: ubuntu-22.04
+    environment: "Preview"
+    needs: pre_job
+    if: ${{ needs.pre_job.outputs.should_skip != 'true' }}
+    env:
+      NIXPACKS_VERSION: '1.41.0'
+    steps:
+      - name: 'Checkout Project'
+        uses: 'actions/checkout@v4'
+        with:
+          fetch-depth: 1
+
+      - name: Install Nixpacks
+        run: curl -sSL https://nixpacks.com/install.sh | NIXPACKS_VERSION=$NIXPACKS_VERSION bash -s -- --yes
+
+      - name: Verify Nixpacks version
+        run: nixpacks --version
+
+      - name: Build with Nixpacks
+        run: nixpacks build . --name open-tacos-ci

nixpacks.toml

@@ -2,7 +2,10 @@
 nixPkgs =  ["nodejs_20"]
 
 [phases.install]
-cmds = ["yarn install --no-progress --silence"]
+cmds = [
+  "corepack enable",
+  "yarn install --no-progress --silence"
+]
 
 [phases.build]
 cmds = ["yarn build"]

package.json

@@ -3,6 +3,7 @@
   "description": "Open source climbing route catalog",
   "version": "1.0.0",
   "author": "OpenBeta <hello@openbeta.io>",
+  "packageManager": "yarn@1.22.22",
   "dependencies": {
     "@algolia/autocomplete-js": "1.7.1",
     "@algolia/autocomplete-theme-classic": "1.7.1",