Add helm-unittest tests for envFrom functionality:
- No envFrom by default
- ConfigMap reference support
- Secret reference support
- Multiple envFrom sources
- Optional ConfigMap/Secret support
- Prefix support for variable namespacing
- Compatibility with regular env variables
Add NOTES.txt with envFrom information:
- Show count of envFrom sources
- List each source (ConfigMap or Secret)
- Display optional and prefix settings
Tests ensure envFrom works correctly for loading environment
variables from ConfigMaps and Secrets.
Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>
