chore: add CI

.github/workflows/tests.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+
+  cross:
+    name: Build and Test
+    runs-on: ${{ matrix.os }}
+    env:
+      CGO_ENABLED: 0
+
+    strategy:
+      matrix:
+        go-version: [ stable, oldstable ]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-go@v6
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Build
+        run: go build -ldflags "-s -w" -trimpath ./cmd/nilerr/
+
+      - name: Test
+        run: go test -v -cover ./...
+
+  inception:
+    name: Inception
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-go@v6
+
+      - name: Install
+        run: go install -ldflags "-s -w" -trimpath ./cmd/nilerr/
+
+      - name: Run
+        run: go vet -vettool=$(go env GOPATH)/bin/nilerr ./...

.gitignore

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+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool
+*.out
+coverage.html
+
+# IDE files
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Temporary files
+*.tmp
+*.log
+
+# Binaries for programs and plugins
+*.exe
+/nilerr