New fpga-build image for building iCE40 gateware + RISC-V firmware

this will be needed for building e1-tracer + icE1usb gateware+firmware
on our jenkins slaves.

Change-Id: I7c2072b9524a2038d71c0fac4f2023b92af26382

fpga-build/Dockerfile

@@ -0,0 +1,26 @@
+ARG	USER
+FROM	$USER/debian-buster-build
+
+MAINTAINER Harald Welte <laforge@gnumonks.org>
+
+ARG	TOOLCHAIN_DATE=20200914
+
+RUN	wget --quiet https://github.com/open-tool-forge/fpga-toolchain/releases/download/nightly-$TOOLCHAIN_DATE/fpga-toolchain-linux_x86_64-nightly-$TOOLCHAIN_DATE.tar.gz
+RUN	tar -C /opt -xzf fpga-toolchain-linux_x86_64-nightly-$TOOLCHAIN_DATE.tar.gz && \
+	rm fpga-toolchain-linux_x86_64-nightly-$TOOLCHAIN_DATE.tar.gz
+
+RUN	wget --quiet https://github.com/xpack-dev-tools/riscv-none-embed-gcc-xpack/releases/download/v8.3.0-1.2/xpack-riscv-none-embed-gcc-8.3.0-1.2-linux-x64.tar.gz
+RUN	tar -C /opt -xzvf /xpack-riscv-none-embed-gcc-8.3.0-1.2-linux-x64.tar.gz && \
+	rm xpack-riscv-none-embed-gcc-8.3.0-1.2-linux-x64.tar.gz
+
+RUN	apt-get update && \
+	apt-get upgrade -y && \
+	apt-get install -y --no-install-recommends \
+		wget && \
+	apt-get clean
+
+RUN	useradd -m osmocom
+USER	osmocom
+WORKDIR	/home/osmocom
+
+ENV	PATH=/opt/fpga-toolchain/bin:/opt/xpack-riscv-none-embed-gcc-8.3.0-1.2/bin:${PATH}

fpga-build/Makefile

@@ -0,0 +1 @@
+include ../make/Makefile