Add GitHub action

Author: lopsided98

.github/workflows/build.yaml

@@ -0,0 +1,41 @@
+name: "Build"
+on:
+  push:
+  pull_request:
+jobs:
+  packages:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+      - uses: cachix/install-nix-action@8aa03977d8d733052d78f4e008a241fd1dbf36b3 # v31.10.6
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Get packages from flake
+        id: packages
+        run: |
+          echo -n "packages=" >> "$GITHUB_OUTPUT"
+          nix flake show --json | \
+            jq -c ".packages.\"x86_64-linux\" | keys" >> "$GITHUB_OUTPUT"
+    outputs:
+      packages: ${{steps.packages.outputs.packages}}
+  build:
+    runs-on: ubuntu-latest
+    needs:
+      - packages
+    strategy:
+      fail-fast: false
+      matrix:
+        package: ${{ fromJSON(needs.packages.outputs.packages) }}
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+      - uses: cachix/install-nix-action@8aa03977d8d733052d78f4e008a241fd1dbf36b3 # v31.10.6
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - uses: DeterminateSystems/magic-nix-cache-action@908b263ff629f4cc17666315b7fd3ec127c6244d # v14
+        with:
+          diagnostic-endpoint: ""
+      - run: nix build -L .#${{ matrix.package }}
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: ${{ matrix.package }}
+          path: result