Unable to Set Custom Docker Executable Path

Description: Unable to set a custom Docker executable path (docker.executablePath) in the settings if it already exists. This prevents customization of Docker executable paths.

Steps to Reproduce:

Open settings.json.
Set docker.executablePath to a custom path (e.g., "/home/xyz/.fly/bin/docker").
Save settings.
Observe that the Docker extension defaults to the system path, ignoring the custom path.

Expected Behavior: One should be able to set a custom Docker executable path. (Especially in Exceptional Cases like Flatpak Visual Studio Code)

Proposed Solution: Permit setting docker.executablePath in the current settings, provided it makes logical sense in the context.

Additional Note: There is no documentation(maybe i'm missing something here) on setting the containerCommandfor Docker commands. Including this information would improve clarity.

Note: -- containerCommand - I guess that it may be dynamically set at runtime from "env: withDockerEnvSettings(process.env)""."

Configuration:

{
    "docker.executablePath": "/home/xyz/.fly/bin/docker", // if this exists in current settings
    // Other Docker configurations...
}

{
    "docker.commands.build": "${containerCommand} build --pull --rm -f \"${dockerfile}\" -t ${tag} \"${context}\"",
    "docker.commands.run": "${containerCommand} run --rm -d ${exposedPorts} ${tag}",
    "docker.commands.composeDown": [
        {
            "label": "Compose Down",
            "template": "${composeCommand} ${configurationFile} down"
        }
    ],
    "docker.composeCommand": "flatpak-spawn --host docker-compose",
    "docker.dockerPath": "flatpak-spawn --host docker",
    "workbench.settings.applyToAllProfiles": [
        "docker.dockerPath",
        "docker.composeCommand"
    ],
    "docker.executablePath": "/home/xyz/.fly/bin/docker", // if this exists in current settings
}

Related: I'm trying to recreate the following scenario: https://github.com/microsoft/vscode-docker/issues/3788#issuecomment-1370345414

$ flatpak run --command=bash --filesystem=host com.visualstudio.code
[📦 com.visualstudio.code ~]$ echo $PATH
/home/xyz/.fly/bin:/app/bin:/usr/bin
[📦 com.visualstudio.code bin]$ ls -rlt 
total 72124
-rwxr-xr-x 1 xyz users 73851200 Jan  3 01:23 flyctl
lrwxrwxrwx 1 xyz users       26 Jan  4 18:33 fly -> /home/xyz/.fly/bin/flyctl
-rw-r--r-- 1 xyz users        0 Jan  4 18:33 diole
lrwxrwxrwx 1 xyz users       22 Jan  4 18:34 docker -> /home/xyz/docker.sh

### Tasks
- [ ] https://github.com/microsoft/vscode-docker/issues/3788#issuecomment-1370345414

microsoft / vscode-docker

Unable to Set Custom Docker Executable Path #4198