ci: Fix Docker publish run fail on auto (#496)

As earlier fixes, since `inputs` context is not available, it comes out
as empty which violates the schema of the action we are using as it
expects a bool. This patch fixes the issue.

.github/workflows/publish.yml

@@ -85,7 +85,7 @@ jobs:
  with:
  context: .
  cache-from: type=gha,scope=prod
- no-cache: ${{ inputs.nocache }}
+ no-cache: ${{ inputs.nocache == true }}
  platforms: linux/amd64,linux/arm64
  push: true
  tags: |