ci: add CI workflow (unit tests, vet, build, lint)

Author: xaionaro@dx.center

.github/workflows/ci.yml

@@ -0,0 +1,76 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.24.x"
+
+      - name: Run unit tests
+        run: go test ./grpc/server/acl/ ./grpc/server/certauth/ ./tools/...
+
+  vet:
+    name: Vet
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.24.x"
+
+      - name: Vet packages
+        run: go vet ./grpc/server/acl/ ./grpc/server/certauth/ ./tools/... ./handlestore/
+
+  build:
+    name: Build binaries
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        binary: [jnicli, jniserviceadmin]
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.24.x"
+
+      - name: Build (linux/amd64)
+        env:
+          BINARY: ${{ matrix.binary }}
+        run: CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /dev/null "./cmd/${BINARY}/"
+
+      - name: Build (linux/arm64)
+        env:
+          BINARY: ${{ matrix.binary }}
+        run: CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o /dev/null "./cmd/${BINARY}/"
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.24.x"
+
+      - name: Install golangci-lint v2
+        run: go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest
+
+      - name: Lint
+        run: golangci-lint run --build-tags="" ./grpc/server/acl/ ./grpc/server/certauth/ ./tools/... ./handlestore/ ./cmd/jnicli/ ./cmd/jniserviceadmin/