convert over to pauser - and use ARG for uid/gid of pauser

Dockerfile

@@ -1,8 +1,11 @@
 FROM python:latest
+
+# declare var
+ARG PA_ID
+
 WORKDIR /code
-ENV PJM_UID=500
-ENV PJM_GID=500
-RUN groupadd -g ${PJM_GID} mythtv && useradd -r -u ${PJM_UID} -g ${PJM_GID} mythtv
+RUN groupadd -g ${PA_ID} pauser && useradd -r -u ${PA_ID} -g ${PA_ID} pauser 
+
 # sudo used in dev container
 RUN apt-get update && apt-get -y install libpq-dev mediainfo cmake libgl1-mesa-glx libglib2.0-0 libjpeg-turbo-progs ffmpeg git sudo
 COPY . .
@@ -13,6 +16,7 @@ RUN mkdir -p static/Bin
 RUN mkdir -p static/Import
 RUN mkdir -p static/Storage
 RUN mkdir -p static/Metadata
+RUN pip3 install --upgrade pip
 RUN pip3 install -r requirements.txt
 RUN pip3 install --upgrade pillow --user
 EXPOSE 80
@@ -23,7 +27,8 @@ RUN git log -n 15 > internal/git-log.txt
 RUN ln -s /code/TODO /code/internal/TODO
 RUN ln -s /code/BUGs /code/internal/BUGs
 RUN rm -rf .git
-RUN chown mythtv:mythtv /code
-RUN chown mythtv:mythtv ./static
-RUN chown mythtv:mythtv ./static/*
+RUN chown pauser:pauser /code
+RUN chown pauser:pauser ./static
+RUN chown pauser:pauser ./static/*
+
 CMD ["./wrapper.sh"]