Consolidated run commands.

Dockerfile

@@ -18,18 +18,22 @@ RUN git clone https://github.com/ProtonMail/proton-bridge.git proton-bridge \
 # Create a container for the ProtonMail Bridge.
 FROM alpine:edge
 ENV LANG C.UTF-8
+
+EXPOSE 25/tcp
+EXPOSE 143/tcp
+
 COPY --from=build /usr/src/proton-bridge/Desktop-Bridge /bin/protonmail-bridge
+COPY entrypoint /bin/
+COPY initproton /bin/
 RUN apk add --no-cache \
       libsecret \
       pass \
       socat \
-      su-exec
-COPY entrypoint /bin/
-RUN chmod +x /bin/entrypoint
-COPY initproton /bin/
-RUN chmod +x /bin/initproton
+      su-exec \
+ && chmod +x /bin/entrypoint \
+ && chmod +x /bin/initproton
+
 WORKDIR /var/lib/proton
-EXPOSE 25/tcp
-EXPOSE 143/tcp
+
 ENTRYPOINT ["/bin/entrypoint"]
 CMD ["/bin/initproton"]