Add a Dockerfile to build patched QEMU for Debian (Buster)

debian/vitastor-buster.Dockerfile

@@ -0,0 +1,36 @@
+# Build packages for Debian 10 inside a container
+# cd ..; podman build -v `pwd`/qemu-build:/root/qemu-build -f debian/vitastor-buster.Dockerfile .
+
+FROM debian:buster
+
+WORKDIR /root
+
+RUN echo 'deb http://deb.debian.org/debian buster-backports main' >> /etc/apt/sources.list; \
+    grep '^deb ' /etc/apt/sources.list | perl -pe 's/^deb/deb-src/' >> /etc/apt/sources.list; \
+    echo 'APT::Install-Recommends false;' > /etc/apt/apt.conf
+
+RUN apt-get update
+RUN apt-get -t buster-backports -y install qemu fio liburing1 liburing-dev libgoogle-perftools-dev devscripts
+RUN apt-get -t buster-backports -y build-dep qemu
+RUN apt-get -y build-dep fio
+RUN apt-get -t buster-backports --download-only source qemu-kvm
+RUN apt-get --download-only source fio
+
+ADD qemu-5.0-vitastor.patch qemu-5.1-vitastor.patch /root/vitastor/
+RUN set -e; \
+    mkdir -p /root/qemu-build; \
+    rm -rf /root/qemu-build/*; \
+    cd /root/qemu-build; \
+    dpkg-source -x /root/qemu*.dsc; \
+    if [ -d /root/qemu-build/qemu-5.0 ]; then \
+        cp /root/vitastor/qemu-5.0-vitastor.patch /root/qemu-build/qemu-5.0/debian/patches; \
+        echo qemu-5.0-vitastor.patch >> /root/qemu-build/qemu-5.0/debian/patches/series; \
+    else \
+        cp /root/vitastor/qemu-5.1-vitastor.patch /root/qemu-build/qemu-*/debian/patches; \
+        echo qemu-5.1-vitastor.patch >> /root/qemu-build/qemu-*/debian/patches/series; \
+    fi; \
+    cd /root/qemu-build/qemu-*/; \
+    V=$(head -n1 debian/changelog | perl -pe 's/^.*\((.*?)(~bpo[\d\+]*)\).*$/$1/')~vitastor1; \
+    DEBFULLNAME="Vitaliy Filippov <vitalif@yourcmc.ru>" dch -D buster -v $V 'Plug Vitastor block driver'; \
+    DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage --jobs=auto; \
+    rm -rf /root/qemu-build/qemu-*/