Ensure string output is handled as boolean for 'pull'

Author: treydock

.github/workflows/build.yaml

@@ -69,7 +69,7 @@ jobs:
         with:
           context: .
           file: dockerfiles/dnf/Dockerfile
-          push: ${{ steps.set_tag.outputs.push }}
+          push: ${{ steps.set_tag.outputs.push == "true" }}
           tags: ghcr.io/openchami/image-build:${{ steps.set_tag.outputs.tag }}
 
       - name: Build and push Docker image (EL9)
@@ -79,7 +79,7 @@ jobs:
         with:
           context: .
           file: dockerfiles/dnf/Dockerfile.el9
-          push: ${{ steps.set_tag.outputs.push }}
+          push: ${{ steps.set_tag.outputs.push == "true" }}
           tags: ghcr.io/openchami/image-build-el9:${{ steps.set_tag.outputs.tag }}
 
       - name: Generate release notes