install_miniconda.sh: Install in `/opt/conda/` instead and use full path.
install_miniconda.sh: Install in `/opt/conda/` instead and use full path.

jakirkham/docker_ubuntu_drmaa_conda,jakirkham/docker_basic,nanshe-org/docker_centos_drmaa_conda,DudLab/docker_centos_drmaa_conda,jakirkham/docker_centos_drmaa_conda