add packaging step on azure and refactor pipelines

deployment/Dockerfile.centos

@@ -0,0 +1,29 @@
+FROM centos:7
+
+# Docker build arguments
+ARG SOURCE_DIR=/jellyfin
+ARG ARTIFACT_DIR=/dist
+
+# Docker run environment
+ENV SOURCE_DIR=/jellyfin
+ENV ARTIFACT_DIR=/dist
+ENV IS_DOCKER=YES
+
+# Prepare CentOS environment
+RUN yum update -y \
+  && yum install -y epel-release \
+  && yum install -y @buildsys-build rpmdevtools git yum-plugins-core nodejs-yarn autoconf automake glibc-devel
+
+# Install recent NodeJS and Yarn
+RUN curl -fSsLo /etc/yum.repos.d/yarn.repo https://dl.yarnpkg.com/rpm/yarn.repo \
+  && rpm -i https://rpm.nodesource.com/pub_10.x/el/7/x86_64/nodesource-release-el7-1.noarch.rpm \
+  && yum install -y yarn
+
+# Link to build script
+RUN ln -sf ${SOURCE_DIR}/deployment/build.centos /build.sh
+
+VOLUME ${SOURCE_DIR}
+
+VOLUME ${ARTIFACT_DIR}
+
+ENTRYPOINT ["/build.sh"]