change base image from ubuntu to alpine

build/Dockerfile

@@ -17,8 +17,7 @@ RUN sed -i 's/127.0.0.1/0.0.0.0/g' internal/constants/constants.go
 RUN set -eux; \
     make build-nogui vault-editor
 
-FROM ubuntu:latest
-LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
+FROM alpine:latest
 
 EXPOSE 1025/tcp
 EXPOSE 1143/tcp
@@ -26,11 +25,11 @@ EXPOSE 1143/tcp
 RUN mkdir -p /root/.gnupg && chmod 700 /root/.gnupg
 
 # Install dependencies and protonmail bridge
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
-        pass libsecret-1-0 ca-certificates libfido2-1 \
-        dbus dbus-x11 gnupg2 \
-    && rm -rf /var/lib/apt/lists/*
+RUN apk add --no-cache \
+    gcompat \
+    libsecret \
+    libfido2 \
+    gnupg pass ca-certificates
 
 # Copy bash scripts
 COPY gpgparams entrypoint.sh /protonmail/