Migrate CI/CD from gitlab to github

[AhmetNSimsek]

from: FZJ-INM1-BDA/siibra-python#540 (comment)

CI pipelines to be migrated:

• Migrate CI/CD pipeline ci:checklist:generate-update
• Migrate CI/CD pipeline ci:test:check_connectivity_json
• Migrate CI/CD pipeline ci:test:check_schema
• Migrate CI/CD pipeline ci:test:check_jsons
• Migrate CI/CD pipeline ci:test:check_ebrains_id
• Migrate CI/CD pipeline ci:test:check_map_volume_idx
• Migrate CI/CD pipeline ci:test:region_attr_compliance
• Migrate CI/CD pipeline ci:test:check_maps
• Migrate CI/CD pipeline ci:test:check_maps_precompmesh
• Migrate CI/CD pipeline mirror:push_to_mirror
• Migrate CI/CD pipeline deploy:okd:sync_to_okd
• Migrate CI/CD pipeline deploy:okd:restart_server_pod
• Migrate CI/CD pipeline deploy:okd:get_api_queues
• Migrate CI/CD pipeline deploy:okd:start_new_worker_pods

[xgui3783]

re: migration of actions prefixed deploy: these actions are needed for data validations.

Currently, ebrain2.0 infrastructure resource quota is too limited to deploy another instance of siibra-api. (this is after we quadrepled our quota in the last month).

This leaves us with a few options:

• ask the quota at ebrain to be increased again
• deploy an instance of siibra-api else where (e.g. julich VM?)

will check how feasible it is to deploy it at julich.

[AhmetNSimsek]

Deploy workflow was added with #36, which completes all the todos.