fix: migrate to non-deprecated set-output (#66)

* fix: migrate to non-deprecated set-output

* fix: prevent globbing/word-splitting

deploy.sh

@@ -89,7 +89,7 @@ if [ "$(unzip -l "$ZIP_FILENAME" | grep -q appspec.yml)" = "0" ]; then
 fi
 
 echo "::debug::Zip Archived validated."
-echo "::set-output name=zip_filename::$ZIP_FILENAME"
+echo "zip_filename=$ZIP_FILENAME" >> "$GITHUB_OUTPUT"
 
 # 3) Upload the deployment to S3, drop old archive.
 function getArchiveETag() {
@@ -111,7 +111,7 @@ echo "::debug::Zip uploaded to S3."
 ZIP_ETAG=$(getArchiveETag)
 
 echo "::debug::Obtained ETag of uploaded S3 Zip Archive."
-echo "::set-output name=etag::$ZIP_ETAG"
+echo "etag=$ZIP_ETAG" >> "$GITHUB_OUTPUT"
 
 rm "$ZIP_FILENAME"