Update Dockerfile

Add `--no-cache-dir` and do multistage build to reduce size of Docker image.

Author: nneskildsf

Dockerfile

@@ -1,10 +1,15 @@
-FROM python:3.13-alpine
+FROM python:3.13-alpine AS base
 
 WORKDIR /usr/src/app
 RUN mkdir -p /data
 COPY dist ./dist/
 RUN pip install --no-cache-dir dist/openpectus_database_administration.tar.gz
-RUN pip install openpectus --no-deps
+RUN pip install openpectus --no-deps --no-cache-dir
+RUN rm -R ./dist
+
+# Squash layers to reduce image size
+FROM scratch
+COPY --from=base / /
 
 EXPOSE 8301
-CMD pectus-database-administration --host 0.0.0.0 --port 8301 --database /data/open_pectus_aggregator.sqlite3
+CMD pectus-database-administration --host 0.0.0.0 --port 8301 --database /data/open_pectus_aggregator.sqlite3