Trigger docker build and push action to run on a new release of SiEPIC EBeam PDK

[jasminabrar]

• Previously was not working so fixed it to run when a new version of SiEPIC EBeam PDK is released

• In order to trigger the workflow to also run when a new version of SiEPIC Tools is released we need to communicate between SiEPIC Tools and SiEPIC EBeam PDK. We would need to add an action in SiEPIC Tools that triggers the workflow in SiEPIC EBeam PDK (there is no way to do it just within SiEPIC EBeam PDK). However, to do this we need to create a secret variable in SiEPIC Tools using a personal access token.

[jasminabrar]

Added workflow_dispatch trigger in the GitHub actions so we can trigger them manually.