Updated dockerfile

Dockerfile

@@ -1,20 +1,18 @@
 FROM alpine:latest AS base
-ARG version
-ARG pip_extra=""
-RUN apk add --no-cache python3 py3-pip py3-wheel
-# pip_extra allows use of --pre and test pypi for build purposes
-
-RUN pip install --no-cache-dir ${pip_extra} hashback[server]==${version}
-COPY docs/examples/basic-server.json /etc/hashback/basic-server.json
-RUN hashback-db-admin /data create
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
+    apk add python3 py3-pip py3-wheel
 
+FROM base as build
+COPY /dist/ /hashback/
 
-RUN apk add git
+FROM base as final
 
+RUN --mount=type=cache,sharing=locked,target=/root/.cache \
+    --mount=type=bind,from=build,source=/hashback/,target=/mnt \
+    file=$(ls -1 /mnt) ; pip install /mnt/${file}[server]
 
-COPY / /app
-
-RUN pip install -e /app[server]
+COPY docs/examples/basic-server.json /etc/hashback/basic-server.json
+RUN hashback-db-admin /data create
 
 VOLUME /data
 VOLUME /etc/hashback