tests(py3): Add optional py3 snuba test job to github actions (#20543)

Part of getting tests running on py3

.github/workflows/python.yml

@@ -203,3 +203,114 @@ jobs:
           make travis-test-postgres
         env:
           TEST_GROUP: ${{ matrix.instance }}
+
+  test-py3-snuba:
+    name: 'py3 snuba [ignore fails]'
+    runs-on: ubuntu-16.04
+    continue-on-error: true
+    strategy:
+      matrix:
+        instance: [0]
+
+    env:
+      SENTRY_PYTHON3: 1
+      PIP_DISABLE_PIP_VERSION_CHECK: on
+
+      USE_SNUBA: 1
+      SENTRY_LIGHT_BUILD: 1
+      SENTRY_SKIP_BACKEND_VALIDATION: 1
+
+      PYTEST_SENTRY_DSN: https://6fd5cfea2d4d46b182ad214ac7810508@sentry.io/2423079
+      # XXX(py3): Reruns are disabled for until all tests are passing.
+      PYTEST_ADDOPTS: ""
+      PYTEST_SENTRY_ALWAYS_REPORT: no
+
+      # services configuration
+      SENTRY_REDIS_HOST: redis
+      DATABASE_URL: postgresql://postgres:postgres@localhost/sentry
+      SENTRY_KAFKA_HOSTS: localhost:9092
+      SENTRY_ZOOKEEPER_HOSTS: localhost:2181
+
+      # Number of matrix instances
+      TOTAL_TEST_GROUPS: ${{ strategy.job-total }}
+
+    steps:
+      - name: Install System Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libxmlsec1-dev \
+            libmaxminddb-dev
+
+      - uses: actions/checkout@v2
+
+      - name: Set up outputs
+        id: config
+        env:
+          MATRIX_INSTANCE: ${{ matrix.instance }}
+        run: |
+          # XXX(py3): Minors that aren't latest seem to not be available.
+          echo "::set-output name=python-version::3.6.12"
+          echo "::set-output name=matrix-instance-number::$(($MATRIX_INSTANCE+1))"
+
+      - name: Set up Python ${{ steps.config.outputs.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ steps.config.outputs.python-version}}
+
+      - name: Install pip
+        run: |
+          pip install --no-cache-dir --upgrade "pip>=20.0.2"
+
+      - name: Get pip cache dir
+        id: pip-cache
+        run: |
+          echo "::set-output name=dir::$(pip cache dir)"
+
+      - name: pip cache
+        uses: actions/cache@v1
+        with:
+          path: ${{ steps.pip-cache.outputs.dir }}
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements-*.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
+      - name: Install Python Dependencies
+        env:
+          PGPASSWORD: postgres
+        run: |
+          python setup.py install_egg_info
+          pip install wheel # GitHub Actions does not have this installed by default (unlike Travis)
+          pip install -U -e ".[dev]"
+          # XXX: wasn't able to get this working in requirements_base.
+          # It's possible if you're installing via -r but it breaks -e.
+          pip uninstall -y rb
+          pip install -e git+https://github.com/getsentry/rb.git@master#egg=rb
+
+      - name: Start devservices
+        run: |
+          sentry init
+          docker run \
+            --name sentry_zookeeper \
+            -d --network host \
+            -e ZOOKEEPER_CLIENT_PORT=2181 \
+            confluentinc/cp-zookeeper:4.1.0
+
+          docker run \
+            --name sentry_kafka \
+            -d --network host \
+            -e KAFKA_ZOOKEEPER_CONNECT=127.0.0.1:2181 \
+            -e KAFKA_LISTENERS=INTERNAL://0.0.0.0:9093,EXTERNAL://0.0.0.0:9092 \
+            -e KAFKA_ADVERTISED_LISTENERS=INTERNAL://127.0.0.1:9093,EXTERNAL://127.0.0.1:9092 \
+            -e KAFKA_LISTENER_SECURITY_PROTOCOL_MAP=INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT \
+            -e KAFKA_INTER_BROKER_LISTENER_NAME=INTERNAL \
+            -e KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR=1 \
+            confluentinc/cp-kafka:5.1.2
+          sentry devservices up postgres redis clickhouse snuba
+
+      - name: Python 3.6 snuba backend w/o migrations (${{ steps.config.outputs.matrix-instance-number }} of ${{ strategy.job-total }})
+        if: always()
+        run: |
+          make travis-test-snuba
+        env:
+          TEST_GROUP: ${{ matrix.instance }}