Upgrade openscad to 2021.01

resolves #321

app/api/src/docker/docker-compose.yml

@@ -1,14 +1,5 @@
 services:
 
-  openscad-health:
-    build:
-      context: ./
-      dockerfile: ./openscad/Dockerfile
-    image: openscad
-    command: openscad.health
-    ports:
-      - "5051:8080"
-
   openscad-preview:
     image: openscad
     command: openscad.preview

app/api/src/docker/openscad/Dockerfile

@@ -6,6 +6,7 @@ ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update -qq
 # double check this below, I'm not sure we need inkscape etc
 RUN apt-get -y -qq install software-properties-common dirmngr apt-transport-https lsb-release ca-certificates xvfb imagemagick unzip inkscape
+RUN add-apt-repository ppa:openscad/releases
 RUN apt-get update -qq
 RUN apt-get install -y -qq openscad
 RUN apt-get install -y curl wget