Add a Cypress Test 🌲 (#8295)

* A first, maybe working cypress test

Plus cypress plugins to manage synapses in docker containers

* Fix yaml

* This file is important

* try & find where it's put the artifact

* Download artifact to a directory

* pics or it didn't happen

* Add conditional, otherwise no artifacts on failure...

* Try increasing timeout

also actually give the test a name

* Try in chrome

* Get docker logs to see why it's failing

also document the chrome setting

* Try changing mode on homeserver.yaml

* debug

* More debugging

* more file permissions debugging

* ARGH

* more debug

* sigh

* Eugh, that's not how arguments work

* Add the option to really allow open registration

and remove debug logging / comment fixes

* failure to yaml

* Upload docker logs as artifacts

and temporarily remove contional to test

* Put the conditional back

* Upgrade types in end to end tests

to be compatible with fs-extra types

* Try reducing timeout a bit

also make password more... sensible

* Hex is not octal

* Remove file mode

Seems to be unnecessary since the signing key is perfectly fine

* Give the log files extensions

* Rename workflow file now it also does tests

* Add cypress scripts

* copyright headers

* Use ? operator

Co-authored-by: Travis Ralston <travisr@matrix.org>

* Use develop synapse image

* Tidy up any remaining synapses after each spec run

Also:
 * Move the synapseStart / synapseStop functions out to the top level
   so they can be reused
 * Add a tsconfig file
 * Give the containers names

* Don't upload video on test pass

We don't upload it anyway so tell cypress not to so it can not
bother encoding them

* Enable linting on cypress files

and fix existing lint errors

* Type check cypress files

and make it pass the type checks, specifically:
 * Upgrade sinon fake timers to a version that has the right types
 * Set module resolution
 * Type check cypress files separately

* Rename workflow file again

Probably better to just call it an element web build

* Don't plus + characters in container name

* Fix yaml

* Stream logs to file

* Add note to end to end tester to sya what's been ported

* Put docker rm in finally block

Co-authored-by: Travis Ralston <travisr@matrix.org>

cypress/plugins/synapsedocker/templates/consent/log.config

@@ -0,0 +1,50 @@
+# Log configuration for Synapse.
+#
+# This is a YAML file containing a standard Python logging configuration
+# dictionary. See [1] for details on the valid settings.
+#
+# Synapse also supports structured logging for machine readable logs which can
+# be ingested by ELK stacks. See [2] for details.
+#
+# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
+# [2]: https://matrix-org.github.io/synapse/latest/structured_logging.html
+
+version: 1
+
+formatters:
+    precise:
+        format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s - %(message)s'
+
+handlers:
+    # A handler that writes logs to stderr. Unused by default, but can be used
+    # instead of "buffer" and "file" in the logger handlers.
+    console:
+        class: logging.StreamHandler
+        formatter: precise
+
+loggers:
+    synapse.storage.SQL:
+        # beware: increasing this to DEBUG will make synapse log sensitive
+        # information such as access tokens.
+        level: INFO
+
+    twisted:
+        # We send the twisted logging directly to the file handler,
+        # to work around https://github.com/matrix-org/synapse/issues/3471
+        # when using "buffer" logger. Use "console" to log to stderr instead.
+        handlers: [console]
+        propagate: false
+
+root:
+    level: INFO
+
+    # Write logs to the `buffer` handler, which will buffer them together in memory,
+    # then write them to a file.
+    #
+    # Replace "buffer" with "console" to log to stderr instead. (Note that you'll
+    # also need to update the configuration for the `twisted` logger above, in
+    # this case.)
+    #
+    handlers: [console]
+
+disable_existing_loggers: false