Add GH workflow CI

.github/workflows/ci.yaml

@@ -0,0 +1,86 @@
+
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  deps:
+    name: Dependencies
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Download modules
+        run: go mod download
+
+      - name: Verify go.sum
+        run: go mod verify
+
+  fmt:
+    name: Format
+    needs: deps
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Check formatting
+        run: |
+          output=$(gofmt -l .)
+          if [ -n "$output" ]; then
+            echo "The following files are not formatted:"
+            echo "$output"
+            exit 1
+          fi
+
+  vet:
+    name: Vet
+    needs: deps
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Run go vet
+        run: go vet ./...
+
+  test:
+    name: Test
+    needs: deps
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Run tests
+        run: go test -race -count=1 -v -coverprofile=coverage.out ./...
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: alesr/disco