Refactoring Dockerfile (#118)

* Refactored Dockerfile to simplify the base image declaration

* Refactored Dockerfile to reduce number of layers

Dockerfile

@@ -1,4 +1,6 @@
-FROM alpine:3.21.2 AS builder
+FROM alpine:3.21.2 as base
+
+FROM base AS builder
 
 ARG TARGETPLATFORM
 
@@ -22,7 +24,7 @@ RUN COLOUR='\e[1;93m' && \
   pip install -r /app/requirements.txt && \
   echo -e "${COLOUR}Done.\e[0m"
 
-FROM alpine:3.21.2
+FROM base AS runner
 LABEL maintainer="Patrick Baus <[email protected]>"
 LABEL description="Kraken sensor data aggregator."
 
@@ -41,8 +43,7 @@ COPY --from=builder /opt/venv /opt/venv
 # Enable venv
 ENV PATH="/opt/venv/bin:$PATH"
 
-COPY --from=builder /app /app
-RUN chown -R worker:worker /app
+COPY --from=builder --chown=worker:worker /app /app
 
 USER worker