make it into a JavaScript action

This is a huge step back IMO, but I needed to be able to restore the
original PATH back as a "post" step.  Currently, composite actions don't
support post-actions, but JavaScript ones do.  I needed this due to a
bug: actions/cache wouldn't find Git's tar on windows-2016 (the one in
System32 would get used on windows-2019) if the PATH was cleaned up.

1 files changed, 15 insertions, 0 deletions

diff --git a/restore.js b/restore.js
new file mode 100644
index 0000000..794f6a5
--- /dev/null
+++ b/restore.js
@@ -0,0 +1,15 @@
+const os = require('os');
+const process = require('process');
+
+const core = require('@actions/core');
+
+try {
+    if (os.platform != 'win32') {
+        core.warning('Not going to restore PATH variable on ${os.platform}');
+        process.exit();
+    }
+
+    core.exportVariable('PATH', process.env.ORIG_PATH);
+} catch (error) {
+    core.setFailed(error.message);
+}