docker: add Dockerfile

docker/Dockerfile

@@ -0,0 +1,12 @@
+FROM alpine:latest
+
+RUN apk add bash jq alpine-sdk libusb-dev python3-dev py3-pip \
+	&& pip3 install --upgrade pip
+
+COPY setup-toolchain.sh /opt/
+RUN /opt/setup-toolchain.sh
+
+COPY setup-glasgow.sh /opt/
+RUN /opt/setup-glasgow.sh
+
+ENTRYPOINT [ "glasgow" ]

docker/setup-glasgow.sh

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+#!/bin/bash -eu
+
+git clone https://github.com/GlasgowEmbedded/glasgow.git /opt/glasgow -b master
+cd /opt/glasgow/software
+
+python3 setup.py develop

docker/setup-toolchain.sh

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+#!/bin/bash -eu
+
+read os <<< "linux"
+read arch < <( uname -m )
+
+read url < <(
+  curl -s "https://api.github.com/repos/open-tool-forge/fpga-toolchain/releases/latest" \
+    | jq -r \
+      --arg os "${os}" \
+      --arg arch "${arch}" \
+      '
+        .assets[]
+          | select(.name | contains($os + "_" + $arch))
+          | select(.name | endswith(".tar.gz"))
+          | .browser_download_url
+      '
+)
+
+curl -sL "${url}" | gzip -d | tar -xv -C /opt/
+ln -sv /opt/fpga-toolchain/bin/* /usr/bin/
+
+pip3 install nmigen
+
+yosys -V
+nextpnr-ecp5 -V