Also extend the PATH to /mingw64/bin (or /mingw32/bin)

The `bash` scriptlets are executed by GitHub Actions via this command:

	<path-to>\bash.EXE --noprofile --norc -e -o pipefail {0}

This means that `/etc/profile` is not executed, therefore we cannot rely
on it to set the `PATH` correctly.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

main.ts

@@ -54,10 +54,9 @@ async function run(): Promise<void> {
 
     // Set up PATH so that Git for Windows' SDK's `bash.exe` is found
     core.addPath(`${outputDirectory}/usr/bin`)
-    core.exportVariable(
-      'MSYSTEM',
-      architecture === 'i686' ? 'MING32' : 'MINGW64'
-    )
+    const msystem = architecture === 'i686' ? 'MING32' : 'MINGW64'
+    core.addPath(`${outputDirectory}/${msystem.toLocaleLowerCase()}/bin`)
+    core.exportVariable('MSYSTEM', msystem)
   } catch (error) {
     core.setFailed(error.message)
   }