0.17.0 release New features: - metadata: tools: get version from ccache/sccache Bug fixes: - ccache: don't include current directory in hash Documentation updates: - doc: minor writing improvements - docs: add contact page with IRC/Discord info - README.md: fix docker hub link Container images: - docker: move all images away from debian unstable - docker: upgrade unversioned "gcc" images to gcc 10 - docker: minimize output by default - docker: base: install recommends for auto-apt-proxy - docker: add gcc-11 images - docker: Makefile: add smoke-test target - docker: configure: handle dependencies between our base images