Ensure docker is available within the container for interacting with ther other containers

Author: kraftbj

tools/docker/Dockerfile.monorepo

@@ -15,14 +15,26 @@ WORKDIR /app
 RUN --mount=type=cache,target=/var/lib/apt/lists/,sharing=private \
     export DEBIAN_FRONTEND=noninteractive \
     && apt-get update \
-    && apt-get install -y curl gpg language-pack-en-base software-properties-common \
+    && apt-get install -y curl gpg language-pack-en-base software-properties-common ca-certificates \
     && add-apt-repository ppa:ondrej/php \
     && curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg \
+    # Add Docker's official GPG key
+    && install -m 0755 -d /etc/apt/keyrings \
+    && curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc \
+    && chmod a+r /etc/apt/keyrings/docker.asc \
+    # Add Docker repository
+    && echo \
+      "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
+      $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+      tee /etc/apt/sources.list.d/docker.list > /dev/null \
     && apt-get update \
     && apt-get --purge install -y \
         git \
         unzip \
         zip \
+        docker-ce-cli \
+        docker-buildx-plugin \
+        docker-compose-plugin \
         "php${PHP_VERSION}" \
         "php${PHP_VERSION}-cli" \
         "php${PHP_VERSION}-curl" \