ci: auto-fix PNPM dependency hash in Nix package

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ida0ea49a92b83b771a32424d1e1d9b2b6a6a6964

.github/workflows/nix.yml

@@ -0,0 +1,66 @@
+name: Fix pnpm dependency hash
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-$${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  fix-nix-hash:
+    runs-on: ubuntu-latest
+    permissions: write-all
+    steps:
+      - name: "Checkout Repository"
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 2
+
+      - name: "Get changed files"
+        id: changed-files
+        uses: dorny/paths-filter@v3
+        with:
+          filters: |
+            files:
+              - 'flake.nix'
+              - 'package.json'
+              - 'pnpm-lock.yaml'
+
+      # Exit early if no relevant files are updated
+      - name: Install Nix
+        uses: cachix/install-nix-action@v31.9.0
+        if: steps.changed-files.outputs.files == 'true'
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            substituters = https://cache.nixos.org/ https://feel-co.cachix.org
+            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= feel-co.cachix.org-1:nwEFNnwZvtl4KKSH5LDg+/+K7bV0vcs6faMHAJ6xx0w=
+
+      - name: Update Dependency Hash
+        if: steps.changed-files.outputs.files == 'true'
+        run: |
+          if nix build --print-build-logs .# 2> /tmp/log; then
+            exit 0
+          fi
+
+          hash="$(grep 'got:' /tmp/log | awk '{print $2}')"
+
+          if [ -n "$hash" ]; then
+             echo "hash=$hash"
+             echo "Updating hash in package.nix"
+             sed -e "s#hash =.*\$#hash = \"$hash\";#g" -i nix/package.nix
+           else
+             echo "No hash found, exiting"
+             exit 0 # exit with success, this is not error worthy
+           fi
+
+          git diff
+
+      - name: Update dependencies
+        uses: stefanzweifel/git-auto-commit-action@v7
+        with:
+          commit_message: "meta: auto-update dependencies"