Update README to reflect Go installation

Added installation of Go to Dockerfile and init-firewall.sh.

Author: joecorall

README.md

@@ -32,5 +32,5 @@ If you pass `gemini` or `claude` as the last argument to the `docker run` comman
 
 ## Attribution
 
-- `Dockerfile` and `init-firewall.sh` forked from [anthropics/claude-code](https://github.com/anthropics/claude-code/tree/main/.devcontainer). Added gemini support
+- `Dockerfile` and `init-firewall.sh` forked from [anthropics/claude-code](https://github.com/anthropics/claude-code/tree/main/.devcontainer). Added gemini support and installed `go`
 - `download.sh` copied from [islandora-devops/isle-buildkit](https://github.com/Islandora-Devops/isle-buildkit/tree/main/base/rootfs/usr/local/bin)