kea-dev: Fix pqxx build, add more cleanup

Dockerfile.kea-dev

@@ -37,8 +37,7 @@ RUN cd isc-kea-${KEA_VERSION} \
 	&& echo "usr/bin/kea-msg-compiler" >> debian/kea-common.install \
 	&& dpkg-buildpackage -F
 
-RUN wget https://salsa.debian.org/debian/libpqxx/-/archive/debian/sid/libpqxx-debian-sid.tar.bz2 \
-	&& tar -xf libpqxx-debian-sid.tar.bz2
+RUN git clone --depth 1 https://salsa.debian.org/debian/libpqxx.git libpqxx-debian-sid
 
 RUN cd libpqxx-debian-sid \
 	&& mk-build-deps -i -r -t "apt-get -y -o Debug::pkgProblemResolver=yes --no-install-recommends" \
@@ -50,6 +49,7 @@ RUN cd libpqxx-debian-sid \
 RUN ls -l && dpkg -i *.deb
 
 RUN apt-get -y autoremove --purge devscripts \
+	&& apt-get -y autoremove --purge \
 	&& apt-get clean \
 	&& rm -r *.deb \
 	&& rm -r isc-kea* \