update to multiarch

Dockerfile

@@ -0,0 +1,33 @@
+FROM alpine:3.20
+
+ARG BUILD_DATE
+
+LABEL \
+  maintainer="Logan Marchione <logan@loganmarchione.com>" \
+  org.opencontainers.image.authors="Logan Marchione <logan@loganmarchione.com>" \
+  org.opencontainers.image.title="docker-postfixrelay" \
+  org.opencontainers.image.description="Runs Postfix (as a relay) in Docker" \
+  org.opencontainers.image.created=$BUILD_DATE
+
+RUN apk add --no-cache --update \
+    bash \
+    ca-certificates \
+    cyrus-sasl-login \
+    dumb-init \
+    postfix \
+    postfix-doc \
+    tzdata
+
+EXPOSE 25
+
+VOLUME [ "/var/spool/postfix" ]
+
+COPY ./entrypoint.sh /
+
+COPY VERSION /
+
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/usr/bin/dumb-init", "--", "/entrypoint.sh"]
+
+HEALTHCHECK CMD netstat -ltn | grep -c ":25" || exit 1