feat(installer): add support for Windows OS to Device Agent Installer

[ppawlowski]

Description

This pull request adds support for Windows system to Device Agent Installer.

Related Issue(s)

Closes #383

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[Steve-Mcl]

3. Mismatched path causing install issue:

This is now resolved by 799a92c - thanks

New issue: Because of previous installs (inconsistent state) I am now stuck. The installer stopped the service but later failed to install the service due to it already being present.

C:\Users\xxx\repos\github\flowfuse\dev-env\packages\device-agent\installer\go\out\windows>flowfuse-device-installerr-windows-amd64.exe -o spirit-up-additional -u https://app.flowfuse.com
Logger initialized.
****************************************************************
*            FlowFuse Device Agent Installer                   *
*                                                              *
* This installer will set up the FlowFuse Device Agent on your *
* system and configure it to run as a system service.          *
*                                                              *
****************************************************************
Installing FlowFuse Device Agent...                                                                                     
The working directory c:\opt\flowfuse-device exists and contains Device Agent configuration file                        
Do you want to remove it and continue installation? (Y/n) y                                                             
Stopping service flowfuse-device-agent                                                                                  
Removing contents of c:\opt\flowfuse-device ...                                                                         
Checking Node.js installation...
Installing Node.js 20.19.1...
Node.js installed successfully!
Installing FlowFuse Device Agent package...
FlowFuse Device Agent installed successfully!
Configuring FlowFuse Device Agent...
ℹ Starting Device setup...
✔ Success! This Device can be launched at any time using the following command:
  flowfuse-device-agent
✔ Import existing Node-RED flows? C:\Users\sdmcl\.node-red
✔ Select a flows file: flows.json
ℹ Importing credentials 'C:\Users\sdmcl\.node-red\flows_cred.json'...
ℹ Importing package 'C:\Users\sdmcl\.node-red\package.json'...
↑ Uploading snapshot as the target for this Device...
✔ Success
Configuration completed successfully!
Configuring FlowFuse Device Agent to run as system service...
Installing service flowfuse-device-agent for windows
[ERROR] Service setup failed: failed to create service: exit status 5
Output: Error creating service!
CreateService(): The specified service already exists.


[ERROR] Installation failed: service setup failed: failed to create service: exit status 5
Output: Error creating service!
CreateService(): The specified service already exists.

EDIT:
This is not a new issue - was raised last week:

the installer (nicely) checks the service exists and attempts to stop it before installation, however it then fails to re-install the service (as it already exists)

[ppawlowski]

983ab2a fixes last issue with incorrect path to device-agent binary in service configuration.

[Steve-Mcl]

Working as expected now. Great stuff.