• AWS_ACCESS_KEY_ID S3 Access key
• AWS_SECRET_ACCESS_KEY S3 Secret Access key
• AWS_ENDPOINT S3 Region Domain (eg. s3.us-east-1.amazonaws.com)
• AWS_BUCKET Bucket name

• LOCAL_FILE location of file for upload
• REMOTE_FILE intended location for file

• INCLUDE_SHA256 will include your file postfixed with .sha256 and the sha256 hash for that binary

- name: Release Binary to S3
  uses: mostlytyped/[email protected]
  with:
    args: --acl-public
  env:
    LOCAL_FILE: dist/MyApp
    REMOTE_FILE: downloads/latest/MyApp
    AWS_ENDPOINT: ${{ secrets.AWS_ENDPOINT }}
    AWS_BUCKET: ${{ secrets.AWS_BUCKET }}
    AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
    AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
    INCLUDE_SHA256: true

This action is ultra simple and uses s3cmd under the hood. The execution of a call looks like:

s3cmd put ${LOCAL_FILE} s3://${AWS_BUCKET}/${REMOTE_FILE} $*

adding arguments to (as in the example above) can be done easily with "with" params.