Optimization docker image

docker/Dockerfile

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+FROM nginx:1.17.9
+
+RUN apt-get update && \
+    apt-get install -y curl wget && \
+    apt-get clean && \
+    apt-get autoclean && \
+    rm -Rf /tmp/* && \
+    rm -Rf /var/lib/apt/lists/*
+
+# Install openvidu-call
+RUN mkdir -p /var/www/openvidu-call && \
+    wget -L -O /var/www/openvidu-call/openvidu-call.tar.gz \
+        "https://github.com/OpenVidu/openvidu-call/releases/download/v2.12.0/openvidu-call-2.12.0.tar.gz" && \
+    tar zxf /var/www/openvidu-call/openvidu-call.tar.gz -C /var/www/openvidu-call && \
+    chown -R www-data:www-data /var/www/openvidu-call && \
+    rm /var/www/openvidu-call/openvidu-call.tar.gz
+
+# Nginx conf
+COPY ./openvidu-call.conf /etc/nginx/conf.d/default.conf
+
+# Entrypoint
+COPY ./entrypoint.sh /usr/local/bin
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+CMD /usr/local/bin/entrypoint.sh