fix dockerfile build

Fixes #25

.github/workflows/ci-docker.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Lint Dockerfile
         uses: actions/checkout@v3
 
-      - uses: hadolint/[email protected]
+      - uses: hadolint/hadolint-action@v2.0.0  # 2.1.0 sometimes errors without any output
         with:
           dockerfile: ./Dockerfile
 

Dockerfile

@@ -15,12 +15,14 @@ WORKDIR /build/
 # copy repo
 COPY . .
 
-RUN python  # update pip \
-      -m pip --no-python-version-warning --disable-pip-version-check install --upgrade pip==20.3.4 setuptools \
-    && python -m pip install --upgrade -r requirements-dev.txt  # install dev requirements \
-    && python ./scripts/install_requirements.py  # install plugin requirements \
-    && python ./scripts/build_plist.py  # build plist \
-    && rm -r ./scripts/  # remove scripts dir
+RUN python  '# update pip' \
+      -m pip --no-python-version-warning --disable-pip-version-check install --no-cache-dir --upgrade \
+      pip==20.3.4 \
+      setuptools \
+    && python -m pip install --upgrade -r requirements-dev.txt  '# install dev requirements' \
+    && python ./scripts/install_requirements.py  '# install plugin requirements' \
+    && python ./scripts/build_plist.py  '# build plist' \
+    && rm -r ./scripts/  '# remove scripts dir'
 
 # single layer deployed image
 FROM scratch