Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.
This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.
Closes#8869
Multiple share examples were missing a semicolon on the line defining
the CURLSHcode variable.
Closes: #8697
Reported-by: Michael Kaufmann <mail@michael-kaufmann.ch>
Reviewed-by: Daniel Stenberg <daniel@haxx.se>
