Fixes lintian: file-contains-trailing-whitespace
See https://lintian.debian.org/tags/file-contains-trailing-whitespace.html for more details.

Fixes lintian: debian-watch-uses-insecure-uri
See https://lintian.debian.org/tags/debian-watch-uses-insecure-uri.html for more details.

Fixes lintian: public-upstream-key-not-minimal
See https://lintian.debian.org/tags/public-upstream-key-not-minimal.html for more details.

Fixes lintian: upstream-metadata-file-is-missing
See https://lintian.debian.org/tags/upstream-metadata-file-is-missing.html for more details.

Fixes lintian: debian-rules-sets-dpkg-architecture-variable
See https://lintian.debian.org/tags/debian-rules-sets-dpkg-architecture-variable.html for more details.