[Python] Configure/Setting/Activate a Python Conda environment in Docker

I am trying to set up a conda environment inside a docker container, but it always keep failing at the environment creation stage in the dockerfile with the error: conda activate" fails because shell is not initialized

Below is my Dockerfile:

FROM pytorch/pytorch:1.1.0-cuda10.0-cudnn7.5-runtime

WORKDIR /app

# SET BASH AS CURRENT SHELL
RUN chsh -s /bin/bash
SHELL ["/bin/bash", "-c"]

# INSTALL ANACONDA
RUN apt-get update -y

RUN apt-get install -y wget && \
apt-get clean


RUN rm -rf /opt/conda && \
wget --quiet https://repo.anaconda.com/archive/Anaconda3-2020.11-Linux-x86_64.sh -O ~/anaconda.sh && \
/bin/bash ~/anaconda.sh -b -p /opt/conda && \
rm ~/anaconda.sh && \
ln -s /opt/conda/etc/profile.d/conda.sh /etc/profile.d/conda.sh && \
echo ". /opt/conda/etc/profile.d/conda.sh" >> ~/.bashrc && \
find /opt/conda/ -follow -type f -name '*.a' -delete && \
find /opt/conda/ -follow -type f -name '*.js.map' -delete && \
/opt/conda/bin/conda clean -afy

COPY ./requirements.yml /tmp/requirements.yml


RUN conda update conda \
&& conda env create -f /tmp/requirements3.yml

RUN echo "conda activate nib_docker" >> ~/.bashrc
ENV PATH /opt/conda/envs/nib_docker/bin:$PATH
ENV CONDA_DEFAULT_ENV $nib_docker

COPY . .
CMD [ "python", "-u", "train.py" ]

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