Add an action to publish the grammar automatically

Checklist:

[x] All tests pass in CI.
[ ] The script/parse-examples passes without issues.
[ ] There are sufficient tests for the new fix/feature.
[ ] Grammar rules have not been renamed unless absolutely necessary.
[ ] The conflicts section hasn't grown too much.
[ ] The parser size hasn't grown too much (check the value of STATE_COUNT in src/parser.c).

This PR allows to publish automatically tree-sitter-javascript on crates.io when a new tag is set.

Thanks in advance for your review! :)

tree-sitter / tree-sitter-javascript