uses apk del in smtp/Dockerfile to cut layer size

smtp/Dockerfile

@@ -1,18 +1,21 @@
-FROM alpine:3.23
+FROM alpine:3.23 AS build
 
 WORKDIR /
 RUN mkdir -p /var/msmtp
-RUN apk --update --no-cache add git autoconf automake build-base gettext gettext-dev gnutls-dev libtool make texinfo && \
+RUN apk --update --no-cache add git autoconf automake build-base gettext-dev gnutls-dev libtool make texinfo && \
   git clone https://github.com/marlam/msmtp.git --branch msmtp-1.8.32 --single-branch --depth 1
 WORKDIR /msmtp
 RUN autoreconf -fi && \
   ./configure && \
   make && \
-  make install
+  make install && \
+  apk del git autoconf automake build-base gettext-dev gnutls-dev libtool make texinfo
 
+FROM alpine:3.23 AS final
+RUN apk --update --no-cache add gettext
+COPY --from=build /usr/local/bin/msmtp /usr/local/bin/msmtpd /usr/local/bin/
 ARG LOCAL_SMTP_PORT
 EXPOSE $LOCAL_SMTP_PORT
-
 COPY .msmtprc ./
 
 CMD msmtpd \