chore: update docs of ENVBUILDER_GIT_URL to mention devcontainer (#215)

Author: johnstcn

README.md

@@ -329,7 +329,7 @@ On MacOS or Windows systems, we recommend either using a VM or the provided `.de
 | `--insecure` | `ENVBUILDER_INSECURE` |  | Bypass TLS verification when cloning and pulling from container registries. |
 | `--ignore-paths` | `ENVBUILDER_IGNORE_PATHS` |  | The comma separated list of paths to ignore when building the workspace. |
 | `--skip-rebuild` | `ENVBUILDER_SKIP_REBUILD` |  | Skip building if the MagicFile exists. This is used to skip building when a container is restarting. e.g. docker stop -> docker start This value can always be set to true - even if the container is being started for the first time. |
-| `--git-url` | `ENVBUILDER_GIT_URL` |  | The URL of the Git repository to clone. This is optional. |
+| `--git-url` | `ENVBUILDER_GIT_URL` |  | The URL of a Git repository containing a Devcontainer or Docker image to clone. This is optional. |
 | `--git-clone-depth` | `ENVBUILDER_GIT_CLONE_DEPTH` |  | The depth to use when cloning the Git repository. |
 | `--git-clone-single-branch` | `ENVBUILDER_GIT_CLONE_SINGLE_BRANCH` |  | Clone only a single branch of the Git repository. |
 | `--git-username` | `ENVBUILDER_GIT_USERNAME` |  | The username to use for Git authentication. This is optional. |

options.go

@@ -303,7 +303,7 @@ func (o *Options) CLI() serpent.OptionSet {
 			Flag:        "git-url",
 			Env:         WithEnvPrefix("GIT_URL"),
 			Value:       serpent.StringOf(&o.GitURL),
-			Description: "The URL of the Git repository to clone. This is optional.",
+			Description: "The URL of a Git repository containing a Devcontainer or Docker image to clone. This is optional.",
 		},
 		{
 			Flag:        "git-clone-depth",

testdata/options.golden

@@ -94,7 +94,8 @@ OPTIONS:
           Path to an SSH private key to be used for Git authentication.
 
       --git-url string, $ENVBUILDER_GIT_URL
-          The URL of the Git repository to clone. This is optional.
+          The URL of a Git repository containing a Devcontainer or Docker image
+          to clone. This is optional.
 
       --git-username string, $ENVBUILDER_GIT_USERNAME
           The username to use for Git authentication. This is optional.