add working docker-compose elements

testing/downstream_testing/Dockerfile

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+FROM sommersoft/pyenv-pytest:latest
+
+COPY entrypoint.sh /entrypoint.sh
+
+# Add mysql apt repository
+RUN set -ex; \
+# gpg: key 5072E1F5: public key "MySQL Release Engineering <mysql-build@oss.oracle.com>" imported
+	key='859BE8D7C586F538430B19C2467B942D3A79BD29'; \
+	export GNUPGHOME="$(mktemp -d)"; \
+	#gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
+	for server in ha.pool.sks-keyservers.net \
+				  hkp://p80.pool.sks-keyservers.net:80 \
+				  keyserver.ubuntu.com \
+				  hkp://keyserver.ubuntu.com:80 \
+				  pgp.mit.edu; do \
+		gpg --keyserver "$server" --recv-keys "$key" && break || echo "Trying new keyserver..."; \
+	done; \
+	gpg --batch --export "$key" > /etc/apt/trusted.gpg.d/mysql.gpg; \
+	gpgconf --kill all; \
+	rm -rf "$GNUPGHOME"; \
+	apt-key list > /dev/null
+RUN echo 'deb http://repo.mysql.com/apt/debian/ buster mysql-8.0' > /etc/apt/sources.list.d/mysql.list
+
+RUN apt-get update \
+	&& apt-get install --no-install-recommends -y make build-essential libssl-dev zlib1g-dev \
+    libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev xz-utils tk-dev \
+    libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev
+
+RUN apt-get install -y postgresql-client mysql-client
+
+ENTRYPOINT [ "/entrypoint.sh" ]

testing/downstream_testing/docker-compose.yml

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+version: "3"
+services:
+  base_nodb:
+    build: .
+    environment:
+      - DS_NAME
+      - DS_YAML
+      - DS_JOBS
+      - DS_MATRIX_EXCLUDE
+    volumes:
+      - type: bind
+        source: /home/runner/work/pytest/pytest
+        target: /pytest
+        volume:
+          nocopy: true
+    profiles:
+      - nodb
+  
+  base_postgres:
+    build: .
+    environment:
+      - DS_NAME
+      - DS_YAML
+      - DS_JOBS
+      - DS_MATRIX_EXCLUDE
+      - TEST_DB_USER=$USER
+      - TEST_DB_PASSWORD=pytest_djang0
+      - TEST_DB_HOST=postgres_db
+    volumes:
+      - type: bind
+        source: /home/runner/work/pytest/pytest
+        target: /pytest
+        volume:
+          nocopy: true
+    depends_on:
+      - postgres_db
+    profiles:
+      - postgres
+  postgres_db:
+    image: "postgres:latest"
+    environment:
+      - POSTGRES_PASSWORD=pytest_djang0
+      - POSTGRES_USER=$USER
+    volumes:
+      - /etc/passwd:/etc/passwd:ro
+      - ./data/db:/var/lib/postgresql/data
+    profiles:
+      - postgres
+
+  base_mysql:
+    build: .
+    environment:
+      - DS_NAME
+      - DS_YAML
+      - DS_JOBS
+      - DS_MATRIX_EXCLUDE
+      - TEST_DB_USER=root
+      - TEST_DB_PASSWORD=root
+      - TEST_DB_HOST=mysql_db
+    volumes:
+      - type: bind
+        source: /home/runner/work/pytest/pytest
+        target: /pytest
+        volume:
+          nocopy: true
+    depends_on:
+      - mysql_db
+    profiles:
+      - mysql
+  mysql_db:
+    image: "mysql:latest"
+    command: --default-authentication-plugin=mysql_native_password
+    environment:
+      - MYSQL_ROOT_PASSWORD=root
+    volumes:
+      - ./data/db:/var/lib/mysql
+    profiles:
+      - mysql

testing/downstream_testing/entrypoint.sh

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+#!/bin/bash
+
+python3.9 -m pip install --no-cache-dir pyyaml sh
+
+cd /pytest
+python3.9 -u -m testing.downstream_testing.downstream_runner $DS_NAME $DS_YAML $DS_JOBS --matrix-exclude $DS_MATRIX_EXCLUDE