readme: update path-type option (#41) (#42)

* Expand the documentation: add all the possible values and what they do.
* Change the default path-type from 'strict' to 'minimal'.

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Changed
 
+- Change default of option `path-type` from `strict` to `minimal`.
+
 ## [v1.1.2](https://github.com/msys2/setup-msys2/compare/a4332eaf3b970340d6495b2076e1405ee48ea573...05abb8d585d071301cc19e6177945011875d9479)
 
 ### Added

README.md

@@ -95,21 +95,19 @@ Furthermore, the environment variable can be overridden. This is useful when mul
 
 #### path-type
 
-By default, `MSYS2_PATH_TYPE` is set to `strict` by `msys2`. It is possible to override it either using an option or setting the environment variable explicitly:
+Defines which parts of the Windows `$env:PATH` environment variable leak into the MSYS2 environment. Allowed values:
+
+- `strict`: do not inherit anything from `$env:PATH`.
+- `minimal` *(default)*: only inherit the default Windows paths from `$env:PATH` (so that `cmd.exe` and `powershell.exe` are available for example).
+- `inherit`: inherit everything; warning: this can lead to interference with other tools installed on the system.
 
 ```yaml
   - uses: msys2/setup-msys2@v1
     with:
-      path-type: inherit
-  - run: msys2 <command>
+      path-type: minimal
 ```
 
-```yaml
-  - uses: msys2/setup-msys2@v1
-  - run: msys2 <command>
-    env:
-      MSYS2_PATH_TYPE: inherit
-```
+This option corresponds to the `MSYS2_PATH_TYPE` setting in MSYS2; hence it can be set per step through `env`. See [msys2/MSYS2-packages: filesystem/profile](https://github.com/msys2/MSYS2-packages/blob/915946a637e1f2b7e26e32782f3af322009293db/filesystem/profile#L28-L45) for further details about the configuration of each option.
 
 #### release
 

action.yml

@@ -8,7 +8,7 @@ inputs:
   path-type:
     description: 'Default value for MSYS2_PATH_TYPE environment variable: strict, inherit or minimal'
     required: false
-    default: 'strict'
+    default: 'minimal'
   release:
     description: 'Retrieve and extract base installation from upstream GitHub Releases'
     required: false