Update CI

.github/workflows/build.yaml

@@ -10,9 +10,13 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v14.1
-    - uses: cachix/cachix-action@v10
+    - uses: cachix/install-nix-action@v18
+      with:
+        extra_nix_config: |
+          experimental-features = nix-command flakes   
+    - uses: cachix/cachix-action@v11
       with:
         name: utdemir
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
-    - run: nix-build
+    - run: nix build
+    - run: nix develop -c echo

.github/workflows/update-flake-lock.yaml

@@ -0,0 +1,21 @@
+name: update-flake-lock
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * 0'
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - name: Install Nix
+        uses: cachix/install-nix-action@v18
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@vX
+        with:
+          token: ${{ secrets.PAT }}
+          pr-title: "Update flake.lock"
+          pr-labels: |
+            dependencies
+            automated