fix docker build args

Dockerfile

@@ -4,17 +4,21 @@ ARG SYSTEM_PACKAGES="graphviz nodejs git-lfs make biber ncurses"
 FROM harbor.pollinger.dev/dockerhub-mirror/alpine:latest AS base
 
 FROM base AS default
+ARG SYSTEM_PACKAGES
 RUN apk add --no-cache texlive texlive-luatex
 RUN luaotfload-tool --update
 RUN apk add --no-cache ${SYSTEM_PACKAGES}
 
 FROM default AS full
+ARG SYSTEM_PACKAGES
 RUN apk add --no-cache texlive-full
 RUN luaotfload-tool --update
 RUN apk add --no-cache ${SYSTEM_PACKAGES}
 
 FROM default AS python
+ARG PYTHON_PACKAGES
 RUN apk add --no-cache ${PYTHON_PACKAGES}
 
 FROM full AS full-python
+ARG PYTHON_PACKAGES
 RUN apk add --no-cache ${PYTHON_PACKAGES}