Add components to centos CI containers for reproducibility

**Is your feature request related to a problem? Please describe.**
In order to debug CI failures, e.g. #4510 the container images should be interactive and reproducible.
After downloading and running the container it's currently missing the spack installation used to installed required packages.

**Describe the solution you'd like**
The location `/opt/spack` from [here](https://github.com/QMCPACK/qmcpack/blob/develop/tests/test_automation/github-actions/ci/run_step.sh#L109) is missing. Also `find /opt -name "spack"` returns empty.

**Describe alternatives you've considered**
N/A

**Additional context**
Not sure if this is intentional when using this spack [image](https://github.com/QMCPACK/qmcpack/blob/develop/config/docker/dependencies/centos-stream/Dockerfile#L2).