Added pip3 dependency

Dockerfile

@@ -1,5 +1,5 @@
 FROM alpine:3.12
-RUN apk update && apk add --no-cache bash git openssh python3
+RUN apk update && apk add --no-cache bash git openssh python3 py3-pip
 
 RUN pip3 install --no-cache-dir -q --upgrade pip
 RUN pip3 install --no-cache-dir -q Django django-extensions pyparsing pydot

entrypoint.sh

@@ -27,10 +27,10 @@ _git_changed() {
 
 # PROGRAM
 echo "Installing dependencies..."
-pip install -r $INPUT_PIP_PATH
+pip3 install -r $INPUT_PIP_PATH
 echo "Creating data model..."
 cd $INPUT_PROJECT_PATH
-python manage.py graph_models -a -g-o $INPUT_OUTPUT_PATH
+python3 manage.py graph_models -a -g-o $INPUT_OUTPUT_PATH
 
 # To keep runtime good, just continue if something was changed
 if _git_changed;