wk1: initial docker image setup

target/scripts/build/packages.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+DEBUG_PACKAGES=(procps)
+POSTFIX_PACKAGES=(postfix)
+DOVECOT_PACKAGES=(dovecot-core dovecot-imapd dovecot-ldap)
+RSPAMD_PACKAGES=(rspamd redis-server)
+FAIL2BAN_PACKAGES=(fail2ban)
+
+PACKAGES=(
+    tini
+    supervisor
+    ${DEBUG_PACKAGES[@]}
+    ${POSTFIX_PACKAGES[@]}
+    ${DOVECOT_PACKAGES[@]}
+    # ${RSPAMD_PACKAGES[@]}
+    # ${FAIL2BAN_PACKAGES[@]}
+)
+
+apt update
+apt install -y "${PACKAGES[@]}"
+apt clean
+
+# TODO: post-installation goes here