ci: use format() for dry_run conditions to handle both string and boolean inputs (#20)

Author: keelerm84

.github/workflows/manual-publish.yml

@@ -37,7 +37,7 @@ jobs:
           dry_run: ${{ inputs.dry_run }}
 
       - name: Attest build provenance
-        if: ${{ !inputs.dry_run }}
+        if: ${{ format('{0}', inputs.dry_run) == 'false' }}
         uses: actions/attest@v4
         with:
           subject-path: 'launchdarkly-openfeature-server-sdk-*.gem'