Minor improvements to the docker image

Dockerfile

@@ -1,9 +1,13 @@
 # Base
-FROM node:18-alpine as base
-ENV NODE_ENV production
+FROM node:18-alpine AS base
+
+ENV NODE_ENV=production
+ENV MAILDEV_WEB_PORT=1080
+ENV MAILDEV_SMTP_PORT=1025
+ENV MAILDEV_MAIL_DIRECTORY=/tmp/maildev
 
 # Build
-FROM base as build
+FROM base AS build
 WORKDIR /root
 COPY . .
 RUN npm install typescript -g \
@@ -14,18 +18,19 @@ RUN npm install typescript -g \
   && npm run build
 
 # Prod
-FROM base as prod
+FROM base AS prod
+
+RUN mkdir -p /tmp/maildev && chown node:node /tmp/maildev
+
 USER node
 WORKDIR /home/node
 
-COPY --chown=node:node . /home/node
-COPY --chown=node:node --from=build /root/node_modules /home/node/node_modules
+COPY --chown=node:node . .
+COPY --chown=node:node --from=build /root/node_modules ./node_modules
 COPY --chown=node:node --from=build /root/dist ./dist
-COPY --chown=node:node bin ./bin
 
-EXPOSE 1080 1025
-ENV MAILDEV_WEB_PORT 1080
-ENV MAILDEV_SMTP_PORT 1025
+EXPOSE $MAILDEV_WEB_PORT $MAILDEV_SMTP_PORT
+
 ENTRYPOINT ["bin/maildev"]
 HEALTHCHECK --interval=10s --timeout=1s \
   CMD wget -O - http://localhost:${MAILDEV_WEB_PORT}${MAILDEV_BASE_PATHNAME}/healthz || exit 1

README.md

@@ -37,6 +37,12 @@ For a guide for usage with Docker,
 
     $ docker run -p 1080:1080 -p 1025:1025 timshel/maildev
 
+By default the following environment variables are set:
+
+- MAILDEV_WEB_PORT=1080
+- MAILDEV_SMTP_PORT=1025
+- MAILDEV_MAIL_DIRECTORY=/tmp/maildev
+
 ## Usage
 
 ```

docs/docker.md

@@ -83,8 +83,9 @@ To use MailDev with Docker Compose, add the following to your
 
 ```yaml
 maildev:
-  image: maildev/maildev
+  image: timshel/maildev
   ports:
+    - "1025:1025"
     - "1080:1080"
 ```