Reduce Docker image size

Author: EpicWink

Diff for: .dockerignore

@@ -1,8 +1,6 @@
 venv/
 .venv
-.git/
 htmlcov/
 __pycache__/
-.github/
 *.egg-info/
 .pytest_cache/

Diff for: .github/workflows/publish-docker-image.yml

@@ -12,7 +12,7 @@ jobs:
     - name: get-tag
       run: echo ::set-output name=tag::${GITHUB_REF#refs/tags/}
     - name: Build image
-      run: docker build . -t epicwink/proxpi:${{ steps.get-tag.outputs.tag }}
+      run: docker buildx build . -t epicwink/proxpi:${{ steps.get-tag.outputs.tag }}
     - name: Login to DockerHub
       run: >
         echo ${{ secrets.DOCKERHUB_PASSWORD }}

Diff for: Dockerfile

@@ -1,9 +1,13 @@
 FROM python:alpine
-RUN apk add --no-cache libxslt libxml2
-ADD . /root/src/proxpi
-RUN apk add --no-cache --virtual .build-deps gcc libc-dev libxslt-dev libxml2-dev \
+
+RUN --mount=source=.,target=/root/src/proxpi,rw \
+    uname -a && cat /etc/issue && apk --version && python --version && pip --version \
+ && apk --no-cache add git \
+ && git -C /root/src/proxpi restore .dockerignore \
  && pip install /root/src/proxpi \
- && apk del .build-deps
+ && apk del --purge git \
+ && pip list
+
 ENV FLASK_APP=proxpi.server
-ENTRYPOINT ["flask"]
-CMD ["run", "--host", "0.0.0.0"]
+ENTRYPOINT ["flask", "run"]
+CMD ["--host", "0.0.0.0"]