You can configure a system to make use of this repository, thus: 
$ sudo tee /etc/apt/sources.list.d/salsa-python-team-packages-sphinxcontrib-runcmd-8250469.sources >/dev/null <<EOF
Types: deb
URIs: https://salsa.debian.org/python-team/packages/sphinxcontrib-runcmd/-/jobs/8250469/artifacts/raw/aptly
Suites: unstable
Components: main
Signed-By:
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 .
 mQENBGjAtt0BCACsmXUYVZxhB7zLKuo/jxJxcjxxMgAOSDReL/EOSjltUUsI5T5W
 /L8+nLaWnDIbTzDckT1Rr207chwPHDAOd8AMY5GeSrwCmRSiiHl7Kwc371na2tr/
 F2s4/NWWzyKzd1Okpv3vqchjEUhKgqJ2z4xpBA6v+E8nV6eY/IB8SDpKXy8/BUOE
 PfLIBkLLNsq6hKKh9NTwvUE4bVl+cAXFRZB0u42rD5XWFE/ZTamx0gUmu7DtUzAD
 rgZNiOaF0+HLuTBD+VQ8OEYNqiEYKfdvQoqLap3VJ8v86ahJeX5FxxZu03Kz1Ieh
 /AaFqCNQJ0HzLvkr+HNM8jdW5RGDy3D82dSBABEBAAG0KlNhbHNhIFBpcGVsaW5l
 IDxzYWxzYS1waXBlbGluZUBkZWJpYW4ub3JnPokBTwQTAQoAORYhBHcuXQW7olth
 sY/PPvWfUWV3yaLCBQJowLbdAxsvBAULCQgHAgYVCgkICwIEFgIDAQIeAQIXgAAK
 CRD1n1Fld8miwtwZB/92B0syPxFu0OyjWA4BUCwwgx8WcpSD0AMn+h63mMvO5hTA
 bDGExKsghEswlx6meau0632/k2mrssD7+2ietW1lB5Z7GBkTg/Iiv/rpX1VDmFfG
 ObrNl6/VRa+1pzIscR4B6mM5kgxv3t0jyy96/XWKQTsv+7bb+bmjZNwwheBkGa7i
 uJ/WMOTllhqfHy4kFkOotSPLSBjQBaCpDKyDbsQZQfRY8jjC390jpLSJHjCzDrcL
 aCwasQhNqWHK4FlMc2rMS+hBajk7o5zntI7FzFxZGnXoS/xbsDbBVQIVrIiTZvVC
 wuXLptwg3Np6faWt2fiyvEOEsPju5tNDY4W3IQhH
 =1v/W
 -----END PGP PUBLIC KEY BLOCK-----
EOF

Alternatively, using the old one-line format, thus: 
$ wget -O - https://salsa.debian.org/python-team/packages/sphinxcontrib-runcmd/-/jobs/8250469/artifacts/raw/aptly/public-key.asc | sudo tee /etc/apt/keyrings/salsa-python-team-packages-sphinxcontrib-runcmd-8250469.asc >/dev/null
$ sudo tee /etc/apt/sources.list.d/salsa-python-team-packages-sphinxcontrib-runcmd-8250469.list >/dev/null <<EOF
deb [signed-by=/etc/apt/keyrings/salsa-python-team-packages-sphinxcontrib-runcmd-8250469.asc] https://salsa.debian.org/python-team/packages/sphinxcontrib-runcmd/-/jobs/8250469/artifacts/raw/aptly unstable main
# deb-src [signed-by=/etc/apt/keyrings/salsa-python-team-packages-sphinxcontrib-runcmd-8250469.asc] https://salsa.debian.org/python-team/packages/sphinxcontrib-runcmd/-/jobs/8250469/artifacts/raw/aptly unstable main
EOF

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