container lifecycle management

lifecycle-sidecar/Dockerfile

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+# Build stage
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apk add --no-cache git ca-certificates
+
+# Copy go mod files
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source
+COPY main.go ./
+
+# Build static binary
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+    -ldflags="-w -s" \
+    -o lifecycle-sidecar \
+    main.go
+
+# Runtime stage
+FROM alpine:3.19
+
+# Install procps for process monitoring (pgrep, kill)
+RUN apk add --no-cache procps ca-certificates
+
+# Create non-root user
+RUN addgroup -g 1000 sidecar && \
+    adduser -D -u 1000 -G sidecar sidecar
+
+WORKDIR /app
+
+# Copy binary from builder
+COPY --from=builder /app/lifecycle-sidecar /app/lifecycle-sidecar
+
+# Run as non-root
+USER sidecar
+
+ENTRYPOINT ["/app/lifecycle-sidecar"]