Update development-environment.md to add warning about flux 1.5

docs/developer/development-environment.md

@@ -17,7 +17,9 @@ There are 2 methods to create a remote k3d cluster. Manually or with IaC/CaC cod
 ### Utilities installed on local workstation
 
 - [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/) cli  
-- [flux](https://toolkit.fluxcd.io/guides/installation/) v2 cli. release [downloads](https://github.com/fluxcd/flux2/release)
+- [flux](https://toolkit.fluxcd.io/guides/installation/) v2 cli. release [downloads](https://github.com/fluxcd/flux2/release) 
+
+**Note:** there is an issue with flux v0.15.0 causing helm to fail with duplicate key errors. Brew/yum/apt-get will probably install that version or newer. Instead, please use the [install flux script](https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/master/scripts/install_flux.sh) or manually install an older version such as v0.14.2 from [fluxcd's git repo](https://github.com/fluxcd/flux2/releases/tag/v0.14.2).
 
 ## Manual Creation of a Development Environment