update: Mark go as a required bin for otterdog (#289)

* update: Mark go as a required bin for otterdog

Required by one of the dep packages in otterdog (gojsonnet).

* Update mechanism to install a recent go version

Signed-off-by: Thomas Neidhart <thomas.neidhart@eclipse-foundation.org>

* Add go to system requirements

Signed-off-by: Thomas Neidhart <thomas.neidhart@eclipse-foundation.org>

---------

Signed-off-by: Thomas Neidhart <thomas.neidhart@eclipse-foundation.org>
Co-authored-by: Thomas Neidhart <thomas.neidhart@eclipse-foundation.org>

README.md

@@ -18,6 +18,7 @@ It is actively developed by the Eclipse Foundation and used to manage its numero
 To install and use the cli part of otterdog you have to install the following:
 
 * git (mandatory): install using `apt install git`
+* go (mandatory): install using `apt install golang-1.23` or `snap install go`
 * otterdog (mandatory): install using `pipx install otterdog`
 * bitwarden cli tool (optional): install using `snap install bw`
 * pass cli tool (optional): install using `apt install pass`
@@ -36,6 +37,7 @@ The documentation is available at [otterdog.readthedocs.io](https://otterdog.rea
 
 * python3.10+ (mandatory): e.g. install using `apt install python3` or `pyenv`
 * git (mandatory): install using `apt install git`
+* go (mandatory): install using `apt install golang-1.23` or `snap install go`
 * poetry (mandatory): install using `curl -sSL https://install.python-poetry.org | python3 -` or `pipx install poetry`
 * bitwarden cli tool (optional): install using `snap install bw`
 * pass cli tool (optional): install using `apt install pass`