ci: automatically create github releases on tags

[figsoda]

You can also manually trigger a release by running the manual-release workflow

example of automatically tagged release: https://github.com/figsoda/ouch/releases/tag/untagged-1d9b17af30fbd434b692
example of a manual release: https://github.com/figsoda/ouch/releases/tag/untagged-ff9bc3f1806199ed6c0a

doing manual releases in this repository won't be possible until this is merged into main

This is what the tarball looks like:

Archive: /path/to/ouch-x86_64-pc-windows-gnu.tar.gz
└── ouch-x86_64-pc-windows-gnu
   ├── LICENSE
   ├── README.md
   ├── completions
   │  ├── _ouch
   │  ├── ouch.bash
   │  ├── ouch.elv
   │  ├── _ouch.ps1
   │  └── ouch.fish
   ├── man
   │  ├── ouch.1
   │  ├── ouch-list.1
   │  ├── ouch-compress.1
   │  └── ouch-decompress.1
   ├── ouch.exe
   └── CHANGELOG.md

[figsoda]

new manual release: https://github.com/figsoda/ouch/releases/tag/untagged-fb58947f9075579fa1df

[marcospb19]

LGTM 🎉

EDIT: oops

[marcospb19]

LGTM 🎉