Merge pull request #2345 from tsloughter/s3-cp-release

use 'aws cp' when copying escript to s3

.github/workflows/publish.yml

@@ -41,4 +41,4 @@ jobs:
     - name: Copy rebar3 escript to S3
       if: "!github.event.release.prerelease"
       run: |
-        aws s3 sync ./rebar3 s3://rebar3
+        aws s3 cp ./rebar3 s3://rebar3