ci: add unified quality gates workflow

.github/workflows/ci.yml

@@ -0,0 +1,116 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - run: go vet ./...
+      - run: go build ./...
+
+  test:
+    name: test (warn-only)
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - name: Unit tests with race detector
+        run: |
+          go test -race -shuffle=on -count=1 -timeout=15m \
+            -coverprofile=coverage.out -covermode=atomic ./...
+      - name: Upload coverage profile
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage
+          path: coverage.out
+          if-no-files-found: ignore
+
+  lint:
+    name: lint (warn-only)
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.61.0
+          args: --timeout=5m
+
+  coverage:
+    name: coverage (warn-only)
+    needs: test
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - name: Download coverage profile
+        uses: actions/download-artifact@v4
+        with:
+          name: coverage
+      - name: Enforce coverage thresholds
+        run: |
+          go install github.com/vladopajic/go-test-coverage/v2@v2.11.4
+          go-test-coverage --config .testcoverage.yml
+
+  vulncheck:
+    name: vulncheck (warn-only)
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - name: govulncheck
+        run: |
+          go install golang.org/x/vuln/cmd/govulncheck@latest
+          govulncheck ./...
+
+  gosec:
+    name: gosec (warn-only)
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+      - name: gosec
+        run: |
+          go install github.com/securego/gosec/v2/cmd/gosec@v2.21.4
+          gosec -quiet -severity=medium -confidence=medium ./...