
CI: Get Turbo C 2.01 and maybe decrypt
Notes:
1/ Set the Github Actions variables as follows
a) TC201_ARCHIVE_PATHNAME to the URL without final component.
b) TC201_ARCHIVE_FILENAME to the name of the file to be downloaded.
2/ If the archive is GPG symmetrically encrypted set the following
secret to your own freecom Github repository secrets to get your PRs
built with Turbo C, otherwise they will only be checked fully
**after** they have been merged.
a) TC201_ARCHIVE_PASSPHRASE to the decryption passphrase.