use pyTooling/Actions/with-post-step instead of docker/login-action

update debian to 7.0+dfsg-7

update debian to 6.2+dfsg-3

update debian to 6.1+dfsg-8+b2

remove Travis

move releasing from Travis CI to GitHub Actions, use eine/tip

docs: update repo shield colour

update debian to 4.2-7

fix: do not clean 'releases' before -p

fix tarball deployment