Add build from source

build/Dockerfile

@@ -0,0 +1,28 @@
+FROM golang:1.13 AS build
+
+# Install dependencies
+RUN apt-get update && apt-get install -y libsecret-1-dev
+
+# Build
+WORKDIR /build/
+COPY build.sh VERSION /build/
+RUN bash build.sh
+
+FROM ubuntu:20.04
+LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
+
+EXPOSE 25/tcp
+EXPOSE 143/tcp
+
+# Install dependencies and protonmail bridge
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends socat pass libsecret-1-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy bash scripts
+COPY gpgparams entrypoint.sh /protonmail/
+
+# Copy protonmail
+COPY --from=build /build/proton-bridge/Desktop-Bridge /protonmail/
+
+ENTRYPOINT ["bash", "/protonmail/entrypoint.sh"]