fix: Build binary with cleanup-cache TFO-MCP

Author: zeroc0d3

Dockerfile

@@ -15,15 +15,14 @@ WORKDIR /build
 # Set GOPRIVATE to bypass checksum database for telemetryflow SDK
 ENV GOPRIVATE=github.com/telemetryflow/*
 
-# Copy source code
-COPY . .
+# Copy go module files first for better caching
+COPY go.mod go.sum ./
 
-# Cleanup Cache
-RUN go clean -modcache -cache
-RUN rm -f go.sum
+# Download dependencies (leverages Docker layer caching)
+RUN go mod download && go mod verify
 
-# Download dependencies
-RUN go mod download
+# Copy source code
+COPY . .
 
 # Build arguments
 ARG VERSION=1.1.2