Fix: Dockerfile --chown for non-root user permissions

.github/workflows/security.yml

@@ -29,9 +29,20 @@ jobs:
       run: |
         go install github.com/securego/gosec/v2/cmd/gosec@v2.22.2
         gosec -exclude=G115 ./...
-    - name: Run Trivy vulnerability scanner
+    - name: Run Trivy vulnerability scanner (filesystem)
       uses: aquasecurity/trivy-action@bfa4b33a029b9aa80ddb784b45574c30e072c59e # 0.24.0
       with:
         scan-type: 'fs'
         severity: 'CRITICAL,HIGH'
         exit-code: '1'
+
+    - name: Build Docker image
+      run: |
+        docker build -t flowgre:scan --build-arg VERSION=scan .
+
+    - name: Run Trivy vulnerability scanner (Docker image)
+      uses: aquasecurity/trivy-action@bfa4b33a029b9aa80ddb784b45574c30e072c59e # 0.24.0
+      with:
+        image-ref: 'flowgre:scan'
+        severity: 'CRITICAL,HIGH'
+        exit-code: '1'

Dockerfile

@@ -4,40 +4,43 @@
 # ---------------------------------------------------------------------------
 # Build stage — compile a fully static binary (CGO_ENABLED=0)
 # ---------------------------------------------------------------------------
-FROM golang:1.26-alpine AS build-stage
+FROM golang:1.26-alpine3.24 AS build-stage
 
 WORKDIR /src
 
 # Cache dependency resolution layer separately from source code.
 COPY go.mod go.sum ./
 RUN go mod download
 
+ARG VERSION=dev
+
 # Copy source and build a static binary.
 # TARGETARCH is auto-injected by BuildKit (arm64 on this host, amd64 on CI).
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -ldflags "-s -w" -o /flowgre .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -ldflags "-s -w -X main.version=${VERSION}" -o /flowgre .
 
 # ---------------------------------------------------------------------------
 # Runtime stage — minimal Alpine image, non-root user
 # ---------------------------------------------------------------------------
-FROM alpine:3.21
+FROM alpine:3.24
 
 RUN addgroup -S flowgre && \
     adduser -S -g flowgre flowgre
 
 WORKDIR /opt/app
-COPY --from=build-stage /flowgre ./flowgre
+COPY --chown=flowgre:flowgre --from=build-stage /flowgre ./flowgre
 
 USER flowgre
 
 ENTRYPOINT ["/opt/app/flowgre"]
 
 # OCI labels — version is injected at build time via --build-arg
 ARG VERSION=dev
-LABEL org.opencontainers.image.source="https://github.com/dmabry/flowgre" \
+LABEL org.opencontainers.image.version="${VERSION}" \
+      org.opencontainers.image.source="https://github.com/dmabry/flowgre" \
       org.opencontainers.image.description="NetFlow v9 / IPFIX packet generator for collector stress testing" \
       org.opencontainers.image.licenses="Apache-2.0" \
-      org.opencontainers.image.version="${VERSION}"
+      org.opencontainers.image.vendor="Flowgre Team"
 
 # No HEALTHCHECK — flowgre is a CLI tool, not a daemon.
 # The /health endpoint only exists in barrage mode with -web flag.

docker-compose.yml

@@ -0,0 +1,18 @@
+services:
+  flowgre:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        VERSION: dev
+    image: flowgre:dev
+    container_name: flowgre
+    network_mode: "host"
+    # Override command - examples:
+    # single mode:
+    # command: ["single", "-server", "127.0.0.1", "-port", "9995", "-count", "10"]
+    # barrage mode:
+    # command: ["barrage", "-server", "127.0.0.1", "-port", "9995", "-workers", "2", "-delay", "100"]
+    # ipfix mode:
+    # command: ["ipfix", "-server", "127.0.0.1", "-port", "9995", "-count", "10"]
+    command: ["--help"]