Add Dockerfile for building the bootloader.

Dockerfile

@@ -0,0 +1,36 @@
+FROM golang:1.21-bookworm
+
+ARG TAMAGO_VERSION
+ARG LOG_ORIGIN
+ARG LOG_PUBLIC_KEY
+ARG OS_PUBLIC_KEY1
+ARG OS_PUBLIC_KEY2
+
+# Install dependencies.
+RUN apt-get update && apt-get install -y make
+RUN apt-get install -y wget
+RUN apt-get install -y binutils-arm-none-eabi
+RUN apt-get install -y u-boot-tools
+
+RUN wget "https://github.com/usbarmory/tamago-go/releases/download/tamago-go${TAMAGO_VERSION}/tamago-go${TAMAGO_VERSION}.linux-amd64.tar.gz"
+RUN tar -xvf "tamago-go${TAMAGO_VERSION}.linux-amd64.tar.gz" -C /
+
+WORKDIR /build
+
+COPY . .
+
+# Set Tamago path for Make rule.
+ENV TAMAGO=/usr/local/tamago-go/bin/go
+
+# The Makefile expects verifiers to be stored in files, so do that.
+RUN echo "${LOG_PUBLIC_KEY}" > /tmp/log.pub
+RUN echo "${OS_PUBLIC_KEY1}" > /tmp/os1.pub
+RUN echo "${OS_PUBLIC_KEY2}" > /tmp/os2.pub
+
+# Firmware transparency parameters for output binary.
+ENV LOG_ORIGIN=${LOG_ORIGIN} \
+    LOG_PUBLIC_KEY="/tmp/log.pub" \
+    OS_PUBLIC_KEY1="/tmp/os1.pub" \
+    OS_PUBLIC_KEY2="/tmp/os2.pub"
+
+RUN make imx