Add CI

Signed-off-by: Slendi <slendi@socopon.com>

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: Build project
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-22.04
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v3
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+      - name: Building monolith package
+        run: nix build .#monolith
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: result
+          path: result