build: add docker build support

build/Dockerfile

@@ -0,0 +1,19 @@
+FROM node:alpine AS builder
+
+RUN apk update && apk add --no-cache \
+    build-base \
+    jq \
+    zip \
+    git; \
+    rm -rf /var/cache/apk/*
+
+WORKDIR /app
+
+COPY release.sh .
+COPY possum.pem .
+
+RUN ./release.sh
+
+FROM scratch AS releaser
+
+COPY --from=builder /app/privacypossum/possum.zip /

build/Makefile

@@ -0,0 +1,6 @@
+.PHONY: build
+build:
+	@docker build \
+	--target=releaser \
+	--output=. \
+	.

build/README.md

@@ -0,0 +1,7 @@
+# How to build
+
+Just run the following command:
+
+```bash
+make build
+```

build/possum.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQC1owgVWIMD9GDI
+ZbZF2qbkNouRV3LEl6m/RHlJX8L6CSVAJiQ8ItMVaiT5rqivbxW+Mus1NoP9YZQa
+2sWlct6FEdTzN2zJJN6D2RX5cKJGIAxRWGtiGd6Bq7N0p1xG3EvHDPYNLmBZGJvZ
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+3k90HUlSz/Q+hbr7G9HTQGLKwaIe+dhwNEzA1TZK1Mpx9TDOoBydFhMnmjHc+rKX
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+wQzG4F2JDBZvJnEIxQN6JNxgQN3tBDdP0YThkJ/YAQKBgQDdR4YAJDdi6K7Qa+Qf
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+KWBZ8meq0m5ZRtu4tSr5mSxMGsQL4N7qWd7aBp5cX44IelAJniovms9AClXRtTUd
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+O9AX7hDH7QKBgFjWKScPYykTb3N/jUMs8h0OaHNZYqaZzFa+VuJPFx0bLxuILZAr
+4FpdDZKepz1LcErvZCknCglplOQMtOUfeW5DEnmTJ/gxqW67VTiF1THsoP5/1h7R
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+J5e77/RQdJhiLBsMcnt7/DkO4eJvvO2iQP7lzpQZAoGBAI2oPTccNgVj+aWLguqj
+2Hjsh//LDOoihU0C5mGf5zLzf7Awi1eb5QrjdEZB/iyqjvtHjUAzGuLpcaDim7Gb
+rCufDRHOJYzMBvpaYK+oFVCGes9nsbYqS/RsYWsUJleGuV7Si/TcWgGd+U/CBLYm
+96supGJ5/24AdnMhR/cHDErn
+-----END PRIVATE KEY-----

build/release.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env sh
+
+set -eou pipefail
+
+# Clone git repo.
+git clone --depth=1 --branch master --single-branch https://github.com/cowlicks/privacypossum.git
+cd privacypossum || exit
+
+# Edit the manifest.json version number to the form year.month.day with no leading zeros.
+today=$(date '+%Y.%-m.%-d')
+target="src/manifest.json"
+sed -i "s/2019.7.18/${today}/g" ${target}
+
+# Save and commit.
+git config --global user.email "[email protected]"
+git config --global user.name "Your Name"
+git add . && git commit -m "release"
+
+# Run make release, this tags the repo with the manifest version and builds a zip file.
+cp ../possum.pem .
+make release