fix(adding_hints): adding hints for podman

Co-authored-by: Daniel Pryor <[email protected]>

README.md

@@ -32,6 +32,19 @@ Alternatively, if you don't wish to install the package, run it using `$ vmware_
 docker run -it --rm  -p 9272:9272 -e VSPHERE_USER=${VSPHERE_USERNAME} -e VSPHERE_PASSWORD=${VSPHERE_PASSWORD} -e VSPHERE_HOST=${VSPHERE_HOST} -e VSPHERE_IGNORE_SSL=True -e VSPHERE_SPECS_SIZE=2000 --name vmware_exporter pryorda/vmware_exporter
 ```
 
+When using containers combined with `--env-file` flag, please use capital letters to set bolleans, for example:
+
+```
+$ podman run -it --rm -p 9272:9272 --name vmware_exporter --env-file config.env pryorda/vmware_exporter
+$ cat config.env
+[email protected]
+VSPHERE_PASSWORD=Secure-Pass
+VSPHERE_HOST=192.168.0.1
+VSPHERE_IGNORE_SSL=TRUE
+VSPHERE_SPECS_SIZE=2000
+```
+
+
 ### Configuration and limiting data collection
 
 Only provide a configuration file if enviroment variables are not used. If you do plan to use a configuration file, be sure to override the container entrypoint or add -c config.yml to the command arguments.