refactor: remove templating braces from the if field (#9)

Author: nausicaea

.github/workflows/docker-publish.yml

@@ -92,7 +92,7 @@ jobs:
       # transparency data even for private images, pass --force to cosign below.
       # https://github.com/sigstore/cosign
       - name: Sign the published Docker image
-        if: ${{ github.event_name != 'pull_request' }}
+        if: github.event_name != 'pull_request'
         env:
           # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
           TAGS: ${{ steps.meta.outputs.tags }}