Add test infrastructure code for dendrite unit/integ tests (#2331)

* Add test infrastructure code for dendrite unit/integ tests

Start re-enabling some syncapi storage tests in the process.

* Linting

* Add postgres service to unit tests

* dendrite not syncv3

* Skip test which doesn't work

* Linting

* Add `jetstream.PrepareForTests`

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

.github/workflows/dendrite.yml

@@ -73,6 +73,26 @@ jobs:
     timeout-minutes: 5
     name: Unit tests (Go ${{ matrix.go }})
     runs-on: ubuntu-latest
+    # Service containers to run with `container-job`
+    services:
+      # Label used to access the service container
+      postgres:
+        # Docker Hub image
+        image: postgres:13-alpine
+        # Provide the password for postgres
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: dendrite
+        ports:
+          # Maps tcp port 5432 on service container to the host
+          - 5432:5432
+        # Set health checks to wait until postgres has started
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
     strategy:
       fail-fast: false
       matrix:
@@ -92,6 +112,11 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go${{ matrix.go }}-test-
       - run: go test ./...
+        env:
+          POSTGRES_HOST: localhost
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: dendrite
 
   # build Dendrite for linux with different architectures and go versions
   build: