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

@@ -1,5 +1,5 @@
 # buildstage
-FROM python:2.7.18-alpine3.11 as buildstage
+FROM python:2.7.18-slim-buster as buildstage
 
 # build args
 ARG BUILD_VERSION
@@ -15,12 +15,22 @@ 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 \
+    # update Alpine packages
+    apt-get update && apt-get -y install \
+      # install git -> required for pip to install from git
+      git=1:2.20.1* \
+    && rm -rf /var/lib/apt/lists/* \
+    # update python/pip
+    && python -m pip --no-python-version-warning --disable-pip-version-check install --upgrade pip==20.3.4 setuptools \
+    # install build requirements
+    && python -m pip install --upgrade -r requirements-dev.txt \
+    # install plugin requirements
+    && python ./scripts/install_requirements.py \
+    # build plist file
+    && python ./scripts/build_plist.py \
+    # remove scripts directory
+    && rm -rf ./scripts/
 
 # single layer deployed image
 FROM scratch