control agent can now uboot commands

clitools/docker/uboot-tools.Dockerfile

@@ -0,0 +1,41 @@
+FROM alpine:3.22 AS build
+
+RUN apk add --no-cache \
+    build-base \
+    bison \
+    flex \
+    linux-headers \
+    file \
+    binutils \
+    tar
+
+WORKDIR /src
+
+ARG UBOOT_TAR
+ARG UBOOT_VERSION
+
+COPY ${UBOOT_TAR} /tmp/
+RUN tar zxf "/tmp/$(basename "${UBOOT_TAR}")"
+
+RUN make tools-only_defconfig
+
+# Build the env tools using the supported target.
+RUN make -j"$(nproc)" \
+    HOSTCC=gcc \
+    HOSTLD=gcc \
+    HOSTCFLAGS='-O2' \
+    HOSTLDFLAGS='-static' \
+    envtools
+
+# fw_setenv is the same program; create the link ourselves.
+RUN ln -sf fw_printenv tools/env/fw_setenv
+
+RUN file tools/env/fw_printenv tools/env/fw_setenv
+
+RUN readelf -d tools/env/fw_printenv || true
+
+RUN ! readelf -d tools/env/fw_printenv | grep -q '(NEEDED)'
+
+FROM scratch AS export
+COPY --from=build /src/tools/env/fw_printenv /fw_printenv
+COPY --from=build /src/tools/env/fw_setenv /fw_setenv