finally builds

Dockerfile

@@ -19,14 +19,24 @@ echo "deb $UBUNTU_MIRROR focal-security main universe restricted multiverse" >>
 echo "deb $UBUNTU_MIRROR focal-backports main universe restricted multiverse" >> /etc/apt/sources.list.new && \
 mv /etc/apt/sources.list.new /etc/apt/sources.list
 
-
 # we only install essential system packages here
-ARG SYSTEM_PACKAGES="locales build-essential ca-certificates git golang rsync runit software-properties-common"
+ARG ADDITIONAL_PKGS=""
 
 RUN \
     apt update && \
     apt -y upgrade && \
-    apt -y install $SYSTEM_PACKAGES && \
+    apt -y install \
+        $ADDITIONAL_PKGS \
+        build-essential \
+        ca-certificates \
+        daemontools \
+        git \
+        golang \
+        locales \
+        rsync \
+        runit \
+        software-properties-common \
+    && \
     go get -v -u git.eeqj.de/sneak/runsvinit && \
     cp /root/go/bin/runsvinit /usr/local/sbin/runsvinit && \
     rm -r /root/go && \