updated dockerfile

controller/Dockerfile

@@ -15,12 +15,15 @@ ARG GIT_COMMIT=unknown
 WORKDIR /build
 
 # Cache dependencies first
-COPY go.mod go.sum ./
-RUN go mod download
+COPY go.mod ./
+RUN go mod download || true
 
 # Copy source
 COPY . .
 
+# Generate go.sum and ensure all deps are fetched
+RUN go mod tidy
+
 # Build static binary
 RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build \
     -ldflags="-s -w \