[v3] Add vhost and vport flag to dev command

[abichinger]

Description

This PR adds the following flags to the dev command:

• vport: The vite dev server port, default: 9245

And adds support for the environment variable WAILS_VITE_PORT

server.strictport is set to exit if the specified port is already in use.

Fixes #3379

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

The following commands have been executed inside a new project:

wails3 dev                                   # Port: 9245
wails3 dev -port 3333                        # Port: 3333
WAILS_VITE_PORT=3333 wails3 dev             # Port: 3333
wails3 task dev                              # Port: 9245
wails3 task dev VITE_PORT=3333               # Port: 3333
WAILS_VITE_PORT=3333 wails3 task dev        # Port: 3333
WAILS_VITE_PORT=3333 wails3 dev -port=2222  # Port: 2222

Executing wails3 dev twice triggered the following error message:

  ERROR   listen tcp 127.0.0.1:9245: bind: address already in use

• Windows
• macOS
• Linux

Test Configuration

# System
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
| Name         | Manjaro Linux                                                                                                  |
| Version      | Unknown                                                                                                        |
| ID           | manjaro                                                                                                        |
| Branding     |                                                                                                                |
| Platform     | linux                                                                                                          |
| Architecture | amd64                                                                                                          |
| CPU          | AMD Ryzen 5 3600 6-Core Processor                                                                              |
| GPU 1        | Navi 10 [Radeon RX 5600 OEM/5600 XT / 5700/5700 XT] (Advanced Micro Devices, Inc. [AMD/ATI]) - Driver: amdgpu  |
| Memory       | 32GB                                                                                                           |
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

# Build Environment
┌─────────────────────────────────────────────────────────────────────────────────────────────────┐
| Wails CLI      | v3.0.0-alpha.4                                                                 |
| Go Version     | go1.22.0                                                                       |
| Revision       | 1b288a0a1a37c849a4edc22430b372e8469308ec                                       |
| Modified       | true                                                                           |
| -buildmode     | exe                                                                            |
| -compiler      | gc                                                                             |
| CGO_CFLAGS     |                                                                                |
| CGO_CPPFLAGS   |                                                                                |
| CGO_CXXFLAGS   |                                                                                |
| CGO_ENABLED    | 1                                                                              |
| CGO_LDFLAGS    |                                                                                |
| DefaultGODEBUG | httplaxcontentlength=1,httpmuxgo121=1,tls10server=1,tlsrsakex=1,tlsunsafeekm=1 |
| GOAMD64        | v1                                                                             |
| GOARCH         | amd64                                                                          |
| GOOS           | linux                                                                          |
| vcs            | git                                                                            |
| vcs.modified   | true                                                                           |
| vcs.revision   | 1b288a0a1a37c849a4edc22430b372e8469308ec                                       |
| vcs.time       | 2024-04-23T14:32:21Z                                                           |
└─────────────────────────────────────────────────────────────────────────────────────────────────┘

# Dependencies
┌───────────────────────────┐
| gcc        | 13.2.1-5     |
| libgtk-3   | 1:3.24.41-1  |
| libwebkit  | 2.42.5-2     |
| npm        | 10.5.0       |
| pkg-config | 2.1.0-2      |
└─ * - Optional Dependency ─┘

# Diagnosis
 SUCCESS  Your system is ready for Wails development!

Checklist:

• I have updated website/src/pages/changelog.mdx with details of this PR
• My code follows the general coding style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[leaanthony]

Thanks for taking the time to open this. Can you please follow the v3 feedback guide during the alpha stage? This is to make sure contributions are in line with the development and prevent unnecessary work.

Thank you!

https://v3alpha.wails.io/getting-started/feedback/#__tabbed_1_3