link to the podman docs

Author: bcumming

docs/build-install/index.md

@@ -26,4 +26,4 @@ There are multiple ways to install Python software.
 
 ## Containers
 
-CSCS provides tools for building software in containers
+CSCS provides [Podman][ref-build-containers] for building software in containers

mkdocs.yml

@@ -71,7 +71,7 @@ nav:
     - 'Building and Installing software':
       - build-install/index.md
       - 'uenv': build-install/uenv.md
-      - 'Containers': build-install/containers.md
+      - 'containers (podman)': build-install/containers.md
       - 'Python with pip': build-install/pip.md
     - 'Debugging and Performance Analysis':
       - software/devtools/index.md