Add docker-compose files required by pipeline

.buildkite/docker-compose-env

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+CI
+BUILDKITE
+BUILDKITE_BUILD_NUMBER
+BUILDKITE_BRANCH
+BUILDKITE_BUILD_NUMBER
+BUILDKITE_JOB_ID
+BUILDKITE_BUILD_URL
+BUILDKITE_PROJECT_SLUG
+BUILDKITE_COMMIT
+BUILDKITE_PULL_REQUEST
+BUILDKITE_TAG
+CODECOV_TOKEN
+TRIAL_FLAGS

.buildkite/docker-compose.py35.pg95.yaml

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+version: '3.1'
+
+services:
+
+  postgres:
+    image: postgres:9.5
+    environment:
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_INITDB_ARGS: "--lc-collate C --lc-ctype C --encoding UTF8"
+    command: -c fsync=off
+
+  testenv:
+    image: python:3.5
+    depends_on:
+      - postgres
+    env_file: docker-compose-env
+    environment:
+      SYNAPSE_POSTGRES_HOST: postgres
+      SYNAPSE_POSTGRES_USER: postgres
+      SYNAPSE_POSTGRES_PASSWORD: postgres
+    working_dir: /src
+    volumes:
+      - ${BUILDKITE_BUILD_CHECKOUT_PATH}:/src

.buildkite/docker-compose.py37.pg11.yaml

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+version: '3.1'
+
+services:
+
+  postgres:
+    image: postgres:11
+    environment:
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_INITDB_ARGS: "--lc-collate C --lc-ctype C --encoding UTF8"
+    command: -c fsync=off
+
+  testenv:
+    image: python:3.7
+    depends_on:
+      - postgres
+    env_file: docker-compose-env
+    environment:
+      SYNAPSE_POSTGRES_HOST: postgres
+      SYNAPSE_POSTGRES_USER: postgres
+      SYNAPSE_POSTGRES_PASSWORD: postgres
+    working_dir: /src
+    volumes:
+      - ${BUILDKITE_BUILD_CHECKOUT_PATH}:/src

.buildkite/docker-compose.py37.pg95.yaml

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+version: '3.1'
+
+services:
+
+  postgres:
+    image: postgres:9.5
+    environment:
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_INITDB_ARGS: "--lc-collate C --lc-ctype C --encoding UTF8"
+    command: -c fsync=off
+
+  testenv:
+    image: python:3.7
+    depends_on:
+      - postgres
+    env_file: docker-compose-env
+    environment:
+      SYNAPSE_POSTGRES_HOST: postgres
+      SYNAPSE_POSTGRES_USER: postgres
+      SYNAPSE_POSTGRES_PASSWORD: postgres
+    working_dir: /src
+    volumes:
+      - ${BUILDKITE_BUILD_CHECKOUT_PATH}:/src

.buildkite/docker-compose.py38.pg12.yaml

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+version: '3.1'
+
+services:
+
+  postgres:
+    image: postgres:12
+    environment:
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_INITDB_ARGS: "--lc-collate C --lc-ctype C --encoding UTF8"
+    command: -c fsync=off
+
+  testenv:
+    image: python:3.8
+    depends_on:
+      - postgres
+    env_file: docker-compose-env
+    environment:
+      SYNAPSE_POSTGRES_HOST: postgres
+      SYNAPSE_POSTGRES_USER: postgres
+      SYNAPSE_POSTGRES_PASSWORD: postgres
+    working_dir: /src
+    volumes:
+      - ${BUILDKITE_BUILD_CHECKOUT_PATH}:/src

.buildkite/docker-compose.sytest.py37.redis.yaml

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+version: '3.1'
+
+services:
+
+  redis:
+    image: redis:5.0
+
+  sytest:
+    image: matrixdotorg/sytest-synapse:py37
+    depends_on:
+      - redis
+    env_file: docker-compose-env
+    environment:
+      POSTGRES: "1"
+      WORKERS: "1"
+      BLACKLIST: "synapse-blacklist-with-workers"
+      REDIS: "redis"
+    working_dir: "/src"
+    entrypoint: ""
+    volumes:
+      - ${BUILDKITE_BUILD_CHECKOUT_PATH}:/src
+      - ${BUILDKITE_BUILD_CHECKOUT_PATH}/logs:/logs