Proposal: Support ability to force the docker build and push workflow to push images

I am working on writing an E2E test using knuu, but dev flow currently requires a PR be merged to main or a release branch before any images are actually built an pushed.

In `celestia-app` it is currently possible to use `workflow_dispatch` to trigger the `reusable_dockerfile_pipeline` workflow, however the actual build and push of the image is skipped due to the issue mentioned above.

It would be nice to be able to trigger builds of development images. A simple solution would be add an extra input to the workflow which would be propagated down to trigger the build & push, and would be set via the `workflow_dispatch` input of the calling repo.