Update sync Dockerfile to work with new version of Alpine

sync/Dockerfile

@@ -17,10 +17,12 @@ RUN ./gradlew build
 
 WORKDIR /workdir
 
-RUN python3 -m ensurepip
+RUN apk add py3-pip
+RUN python3 -m venv /tmp/python-venv
+ENV CUSTOMPYTHON=/tmp/python-venv/bin/python
 
 COPY requirements.txt .
-RUN python3 -m pip install -r requirements.txt
+RUN /tmp/python-venv/bin/pip install -r requirements.txt
 
 COPY resolve-deps.sh .
 COPY src ./src

sync/resolve-deps.sh

@@ -42,8 +42,8 @@ export GRADLE_VERSIONS_DIR=/gradle-versions
 mkdir -p "${GRADLE_VERSIONS_DIR}"
 
 echo "Resolving packages and generating gradle config"
-python3 --version
-if ! python3 src/main.py --repo="http://repo:80/releases" --output-dir "$PROJECTS_DIR" /package-list.yaml; then
+$CUSTOMPYTHON --version
+if ! $CUSTOMPYTHON src/main.py -vv --repo="http://repo:80/releases" --output-dir "$PROJECTS_DIR" /package-list.yaml; then
     echo "Gradle generation failed"
     exit 255
 fi