Clean up docker, remove redundant installs

Author: Preocts

Dockerfile

@@ -3,17 +3,16 @@ FROM ubuntu:focal
 RUN apt-get update
 RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends software-properties-common
 RUN add-apt-repository -y 'ppa:deadsnakes/ppa'
-RUN DEBIAN_FRONTEND=noninteractive apt install -y --no-install-recommends python3.8 python3.8-venv
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends python3.8 python3.8-venv python3.9 python3.10 python3.11 python3.12
 RUN rm -rf /var/lib/apt/lists/*
 
 WORKDIR /src
 
 ENV PATH=/venv/bin:$PATH
 RUN python3.8 -m venv /venv
-COPY requirements/ /src/requirements/
-RUN python3.8 -m pip install --upgrade -r requirements/requirements-dev.txt -r requirements/requirements-test.txt --no-cache-dir
+RUN . /venv/bin/activate
+RUN python -m pip install --upgrade tox --no-cache-dir
 
 COPY . /src
-RUN python3.8 -m pip install . --no-cache-dir
 
 CMD ["tox", "-r"]