Modernise CI

.woodpecker/build.yaml

@@ -0,0 +1,21 @@
+steps:
+  build:
+    image: nixos/nix
+    commands:
+      - echo 'experimental-features = flakes nix-command' >> /etc/nix/nix.conf
+      # Lint
+      - "nix flake check"
+      # Test
+      - nix develop --command dotnet test AdventOfCode2023.FSharp
+      - nix develop --command dotnet test AdventOfCode2023.FSharp --configuration Release
+      - nix develop --command alejandra --check .
+      - nix develop --command dotnet tool restore
+      - nix develop --command dotnet fantomas --check .
+      # TODO: if https://github.com/dotnet/sdk/issues/37295 ever gets fixed, remove the PublishAot=false
+      - "nix develop --command dotnet publish AdventOfCode2023.FSharp/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.fsproj --configuration Release -p:PublishAot=false -p:SelfContained=true"
+      - '$(find . -type f -name AdventOfCode2023.FSharp | grep Release | grep publish) "$(pwd)/AdventOfCode2023.FSharp/Test/samples"'
+
+    when:
+      - event: "push"
+        evaluate: 'CI_COMMIT_BRANCH == CI_REPO_DEFAULT_BRANCH'
+      - event: "pull_request"