introduce build stages to reduce build time

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
         uses: actions/checkout@v3
       - name: Build Image
         run: |
-          docker compose build processing
+          docker build --target lua -f processing.Dockerfile -t testIMG .
       - name: Run Tests
         run: |
-          ./run-tests.sh
+          docker run -v ./processing:/processing testIMG busted /processing/topics/ -p %.test%.lua$

processing.Dockerfile

@@ -1,4 +1,21 @@
-FROM ubuntu:mantic
+FROM ubuntu:mantic as lua
+
+# Install Lua and "luarocks" – Lua package manager – https://luarocks.org/, https://packages.ubuntu.com/luarocks
+RUN apt update && apt install -y lua5.3 liblua5.3-dev luarocks
+
+# RUN luarocks install date
+RUN luarocks install busted
+
+# LUA Libaries:
+# - "dkjson" used by parking.lua to write JSON for debugging
+# RUN luarocks install dkjson
+# TODO: We need to find a way to use those packages locally; otherwise using them does not make much sense
+# - "inspect" https://github.com/kikito/inspect.lua
+#   (recommended in https://github.com/openstreetmap/osm2pgsql/blob/master/flex-config/README.md#dependencies)
+# RUN luarocks install inspect
+# - "date" https://luarocks.org/modules/tieske/date, https://github.com/Tieske/date
+
+FROM lua as processing
 
 ARG DEBIAN_FRONTEND=noninteractive
 ENV TZ=Europe/Berlin
@@ -10,21 +27,9 @@ LABEL maintainer="FixMyCity - https://fixmycity.de"
 #   - /var/run/docker.sock:/var/run/docker.sock
 COPY --from=docker:dind /usr/local/bin/docker /usr/local/bin/
 
-# - "luarocks" – Lua package manager – https://luarocks.org/, https://packages.ubuntu.com/luarocks
 RUN apt update && \
-  apt install -y osm2pgsql osmium-tool postgresql-client-15 tzdata wget libpq-dev curl lua5.3 liblua5.3-dev luarocks && \
+  apt install -y osm2pgsql osmium-tool postgresql-client-15 tzdata wget && \
   apt upgrade -y
-# LUA Libaries:
-# - "dkjson" used by parking.lua to write JSON for debugging
-# RUN luarocks install dkjson
-# TODO: We need to find a way to use those packages locally; otherwise using them does not make much sense
-# - "inspect" https://github.com/kikito/inspect.lua
-#   (recommended in https://github.com/openstreetmap/osm2pgsql/blob/master/flex-config/README.md#dependencies)
-# RUN luarocks install inspect
-# - "date" https://luarocks.org/modules/tieske/date, https://github.com/Tieske/date
-
-# RUN luarocks install date
-RUN luarocks install busted
 
 # install node
 RUN apt-get install -y nodejs npm