Refactor: gomplate + debian 13 (#1)

Co-authored-by: Mauro Torrez <mauro@layer7.mx>
Reviewed-on: #1

Dockerfile

@@ -1,7 +1,9 @@
-FROM eumau/debian:bookworm-slim
-LABEL maintainer "Mauro Torrez <mauro@mau.ro>"
+FROM debian:trixie-slim
+LABEL maintainer="Mauro Torrez <mauro@mau.ro>"
 ARG DEBIAN_FRONTEND=noninteractive
-ENV LC_ALL C
+ARG TARGETARCH
+ARG GOMPLATE_VERSION=4.3.0
+ENV LC_ALL=C
 
 ENV BIFF=no
 ENV BOGOFILTER_ENABLE="yes"
@@ -73,6 +75,9 @@ RUN echo "_dev_null: /dev/null" > /etc/aliases \
 	ssl-cert \
 	ca-certificates \
 	bogofilter-sqlite \
+	curl \
+  && curl -o /usr/local/bin/gomplate -sSL "https://github.com/hairyhenderson/gomplate/releases/download/v${GOMPLATE_VERSION}/gomplate_linux-${TARGETARCH}" \
+  && chmod 755 /usr/local/bin/gomplate \
   && rm -rf /var/lib/apt/lists/* \
   && cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf \
   && mkdir -p /etc/postfix/rules \
@@ -110,10 +115,12 @@ RUN echo "_dev_null: /dev/null" > /etc/aliases \
      anvil/unix/chroot=n \
      scache/unix/chroot=n
 
-ADD confd /etc/confd/
-ADD postmap_all /usr/local/bin/
+COPY --chmod=0755 entrypoint.sh /usr/local/bin/
+COPY templates /etc/templates
+COPY postmap_all /usr/local/bin/
 
 VOLUME ["/ssl","/var/spool/postfix"]
 EXPOSE 25/tcp 587/tcp
 
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
 CMD ["postfix","start-fg"]