Add check and deploy GitHub workflows

Author: dwayne

.github/workflows/check.yml

@@ -0,0 +1,17 @@
+name: Check
+
+on:
+  push:
+    branches-ignore:
+      - master
+
+  workflow_call:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - run: nix flake check -L

.github/workflows/deploy.yml

@@ -0,0 +1,34 @@
+name: Deploy
+
+on:
+  push:
+    branches:
+      - master
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    uses: ./.github/workflows/check.yml
+
+  deploy:
+    permissions:
+      contents: write
+    needs: [check]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Configure git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+
+      - run: nix run .#deploy