Add skip_deploy_on_missing_secrets input

[campersau]

To avoid build warnings like:

Warning: Unexpected input(s) 'skip_deploy_on_missing_secrets', valid inputs are ['entryPoint', 'args', 'action', 'app_location', 'azure_static_web_apps_api_token', 'api_build_command', 'api_location', 'app_artifact_location', 'output_location', 'app_build_command', 'repo_token', 'routes_location', 'skip_app_build']

Reference: https://github.com/microsoftgraph/microsoft-graph-explorer-v4/runs/3322794009?check_suite_focus=true#step:4:1

[fuzzzerd]

This seems like a good thing to include, it's also not clear if this needs to be an environment variable or a direct parameter to the github action.

[AaronCrawfis]

@mishapos would you be able to take a look at this? Getting lots of warnings based on this. The action is able to accept this parameter, but it's not registered as a supported param.