feat: add building of SNJS Docker image for e2e testing purposes (#1225)

* feat: add building of SNJS Docker image for e2e testing purposes

* fix: contents of snjs package

* feat: add running e2e test suite

* fix: include mocha directory in the snjs yarn package

* fix: add triggering e2e tests with specific image tag

* fix: mocha tests url

* fix: add tests before publishing new version

* fix: temporary skip linter errors

* Revert "fix: temporary skip linter errors"

This reverts commit c989536930a291677f6ef8cad402feb13f066b8c.

* fix: replace test libraries with unpkg CDN versions

* fix: update yarn lock and remove cached libs

* fix: add missing library to mocha tests

* fix: restore chai-as-promised built version

* fix: serving sncrypto-web in mocha test suite

* fix: add copy of sncrypto-web to gitignore files

packages/snjs/.gitignore

@@ -0,0 +1 @@
+mocha/vendor/sncrypto-web.js