Add a dockerfile for the toolchain image

Dockerfile

@@ -0,0 +1,36 @@
+FROM debian:bookworm as build-stage
+
+RUN apt-get update && apt-get install -y \
+    build-essential flex bison cmake texinfo device-tree-compiler git \
+    u-boot-tools lzop libusb-1.0-0-dev python3 python-is-python3 \
+    unzip libpython3-dev python3-dev locales
+
+# https://devel.rtems.org/ticket/4726
+RUN echo "en_US.ISO-8859-15 ISO-8859-15" >> /etc/locale.gen \
+    && locale-gen
+ENV LANG=en_US.iso885915
+
+WORKDIR /grisp2-rtems-toolchain
+COPY . .
+RUN make install
+
+ENV GRISP_TOOLCHAIN=/grisp2-rtems-toolchain/rtems/5
+ENV GRISP_TC_ROOT=/grisp2-rtems-toolchain/rtems/5
+ENV PATH="/grisp2-rtems-toolchain/rtems/5/bin:${PATH}"
+
+# ------------------------------------------------------------------------------
+
+FROM debian:bookworm-slim as run-stage
+
+RUN apt-get update && apt-get install -y \
+    build-essential flex bison cmake texinfo device-tree-compiler git \
+    u-boot-tools lzop libusb-1.0-0-dev python3 python-is-python3 \
+    unzip libpython3-dev python3-dev && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /grisp2-rtems-toolchain
+COPY --from=build-stage /grisp2-rtems-toolchain/rtems/5/ rtems/5/
+
+ENV GRISP_TOOLCHAIN=/grisp2-rtems-toolchain/rtems/5
+ENV GRISP_TC_ROOT=/grisp2-rtems-toolchain/rtems/5
+ENV PATH="/grisp2-rtems-toolchain/rtems/5/bin:${PATH}"