Install docker dependencies in nginx-proxy-tester image

test/requirements/Dockerfile-nginx-proxy-tester

@@ -5,5 +5,32 @@ ENV PYTEST_RUNNING_IN_CONTAINER=1
 COPY python-requirements.txt /requirements.txt
 RUN pip install -r /requirements.txt
 
+# Add Docker's official GPG key
+RUN apt-get update \
+  && apt-get install -y \
+    ca-certificates \
+    curl \
+    gnupg \
+  && install -m 0755 -d /etc/apt/keyrings \
+  && curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg \
+  && chmod a+r /etc/apt/keyrings/docker.gpg
+
+# Add the Docker repository to Apt sources
+RUN echo \
+  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
+  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+  tee /etc/apt/sources.list.d/docker.list > /dev/null
+
+# Install docker-ce-cli and docker-compose-plugin requirements for Pytest docker_compose fixture
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+    docker-ce-cli \
+    docker-compose-plugin \
+  && apt-get clean \
+  && rm -r /var/lib/apt/lists/*
+
+# Check if docker compose is available
+RUN docker compose version
+
 WORKDIR /test
 ENTRYPOINT ["pytest"]