Add workflow to automate releases from linter repo

[flathubbot]

Started test build 153693

[flathubbot]

Build 153693 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/136783/org.flatpak.Builder.flatpakref

[flathubbot]

Started test build 153921

[flathubbot]

Build 153921 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/137013/org.flatpak.Builder.flatpakref

[flathubbot]

Started test build 153971

[flathubbot]

Build 153971 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/137063/org.flatpak.Builder.flatpakref