Update for bridge 3.0.x.

Dockerfile

@@ -1,23 +1,27 @@
 # Build the ProtonMail Bridge.
-FROM golang:1.16-alpine as build
+FROM golang:1.18-buster as build
 ENV LANG C.UTF-8
-RUN apk add --no-cache \
-      bash \
-      curl \
-      gcc \
-      git \
-      libsecret-dev \
-      make \
-      musl-dev
-WORKDIR /usr/src
 
+# Install required build packages
+RUN apt-get update \
+ && apt-get install -y \
+      bash \
+      build-essential \
+      curl \
+      git \
+      libsecret-1-dev \
+      musl-dev
+
+# Download/build the application
+WORKDIR /usr/src
 ARG RELEASE
 ARG TAG
 RUN if [ -n "$RELEASE" ]; then \
          echo "Using release $RELEASE..." \
       && curl -L -s "https://github.com/ProtonMail/proton-bridge/archive/$RELEASE.tar.gz" | tar zx \
-      && ln -s "proton-bridge-$RELEASE" proton-bridge \
-      && cd proton-bridge \
+	  && export PROTON_BRIDGE="proton-bridge-$(echo $RELEASE | sed -e 's/^\(v\|br\)//')" \
+	  && ln -s "${PROTON_BRIDGE}" proton-bridge \
+      && cd "${PROTON_BRIDGE}" \
   ; else \
          git clone https://github.com/ProtonMail/proton-bridge.git proton-bridge \
       && cd proton-bridge \
@@ -26,21 +30,26 @@ RUN if [ -n "$RELEASE" ]; then \
  && make build-nogui
 
 # Create a container for the ProtonMail Bridge.
-FROM alpine:edge
+FROM debian:stable
 ENV LANG C.UTF-8
 
 EXPOSE 25/tcp
 EXPOSE 143/tcp
 
 COPY --from=build /usr/src/proton-bridge/proton-bridge /bin/proton-bridge
+COPY --from=build /usr/src/proton-bridge/bridge /bin/bridge
 COPY entrypoint /bin/
 COPY initproton /bin/
-RUN apk add --no-cache \
-      libsecret \
-      pass \
-      socat \
-      su-exec \
- && chmod +x /bin/entrypoint \
+RUN apt-get update\
+ && apt-get install -y --no-install-recommends --no-install-suggests\
+      libcap2\
+      libsecret-1-0\
+      gosu\
+      gpg-agent\
+      pass\
+      socat\
+ && rm -rf /var/lib/apt/lists/*\
+ && chmod +x /bin/entrypoint\
  && chmod +x /bin/initproton
 
 WORKDIR /var/lib/proton