Add conda to Manylinux Docker images (pytorch#139903)

We would like to switch https://github.com/pytorch/test-infra/blob/main/.github/workflows/linux_job.yml from ``pytorch/conda-builder`` to
``pytorch/manylinux-builder`` and later to ``pytorch/manylinux_2_28-builder`` . Hence adding conda to these images.

Test Infra PR that does the switch : pytorch/test-infra#5867 - need to be rebased after this PR is merged
Pull Request resolved: pytorch#139903
Approved by: https://github.com/seemethere

Author: atalman

.ci/docker/manywheel/Dockerfile

@@ -144,6 +144,10 @@ COPY --from=libpng             /usr/local/lib/pkgconfig              /usr/local/
 FROM common as cpu_final
 ARG BASE_CUDA_VERSION=10.1
 ARG DEVTOOLSET_VERSION=9
+# Install Anaconda
+ADD ./common/install_conda_docker.sh install_conda.sh
+RUN bash ./install_conda.sh && rm install_conda.sh
+ENV PATH /opt/conda/bin:$PATH
 RUN sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo
 RUN sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/*.repo
 RUN sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/*.repo

.ci/docker/manywheel/Dockerfile_2_28

@@ -120,6 +120,7 @@ ARG DEVTOOLSET_VERSION=11
 # Install Anaconda
 ADD ./common/install_conda_docker.sh install_conda.sh
 RUN bash ./install_conda.sh && rm install_conda.sh
+ENV PATH /opt/conda/bin:$PATH
 # Ensure the expected devtoolset is used
 ENV PATH=/opt/rh/gcc-toolset-${DEVTOOLSET_VERSION}/root/usr/bin:$PATH
 ENV LD_LIBRARY_PATH=/opt/rh/gcc-toolset-${DEVTOOLSET_VERSION}/root/usr/lib64:/opt/rh/gcc-toolset-${DEVTOOLSET_VERSION}/root/usr/lib:$LD_LIBRARY_PATH