Add SyTest support to CI (#704)

Adds SyTest CI through CircleCI.

Also need to add all the tests that currently pass to testfile, but I don't think that's a hard blocker for merging.

.circleci/config.yml

@@ -0,0 +1,35 @@
+version: 2
+jobs:
+  dendrite:
+    docker:
+      - image: matrixdotorg/sytest-dendrite
+    working_directory: /src
+    steps:
+      - checkout
+
+      # Set up dendrite
+      - run: 
+          name: Build Dendrite
+          command: ./build.sh
+      - run: 
+          name: Copy dummy keys to root
+          command: |
+            mv .circleci/matrix_key.pem .
+            mv .circleci/server.key .
+      - run:
+          name: Run sytest with whitelisted tests
+          command: /dendrite_sytest.sh
+
+      - store_artifacts:
+          path: /logs
+          destination: logs
+      - store_test_results:
+          path: /logs
+workflows:
+  version: 2
+  build:
+    jobs:
+      - dendrite:
+          filters:
+            branches:
+              only: master

.circleci/matrix_key.pem

@@ -0,0 +1,5 @@
+-----BEGIN MATRIX PRIVATE KEY-----
+Key-ID: ed25519:zXtB
+
+jDyHsx0EXbAfvM32yBEKQfIy1FHrmwtB1uMAbm5INBg=
+-----END MATRIX PRIVATE KEY-----

.circleci/server.key

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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++yaBExKfroZjsksctNAcAbgpuvhLLG8=
+-----END PRIVATE KEY-----

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,5 +2,5 @@
 
 <!-- Please read CONTRIBUTING.md before submitting your pull request -->
 
-* [ ] I have made sure any new dependencies have been checked into the `vendor/` directory
+* [ ] I have added any new tests that need to pass to `testfile` as specified in [docs/sytest.md](https://github.com/matrix-org/dendrite/blob/master/docs/sytest.md)
 * [ ] Pull request includes a [sign off](https://github.com/matrix-org/dendrite/blob/master/CONTRIBUTING.md#sign-off)

docs/sytest.md

@@ -0,0 +1,8 @@
+# SyTest
+
+Dendrite uses [SyTest](https://github.com/matrix-org/sytest) for its
+integration testing. When creating a new PR, add the test IDs that your PR
+should allow to pass to `testfile` in dendrite's root directory. Not all PRs
+need to make new tests pass. If we find your PR should be making a test pass we
+may ask you to add to that file, as generally Dendrite's progress can be
+tracked through the amount of SyTest tests it passes.

testfile

@@ -0,0 +1,4 @@
+GET /register yields a set of flows
+POST /register can create a user
+POST /register downcases capitals in usernames
+