- Remove old drone build tasks (note - FOSSA will not be ported at this time, discussed in slack)
- create generic setup composit action which can be used by multiple workflows
- create generic lint, i18n-lint and unittest composit action which can be used by multiple workflows
- create generic build-and-upload workflow which can be used by multiple workflows
- trigger build-and-upload on merge to specific branch (TBD)
- trigger build-and-upload on specific tags

Also
- changed name of yarn install:ci as it was used outside of ci

Note
- I'd have liked to group together the workflows used by the build, but things like workflow subfolders
aren't supported