You can configure a system to make use of this repository, thus: 
$ sudo tee /etc/apt/sources.list.d/salsa-go-team-packages-conmon-8291445.sources >/dev/null <<EOF
Types: deb
URIs: https://salsa.debian.org/go-team/packages/conmon/-/jobs/8291445/artifacts/raw/aptly
Suites: unstable
Components: main
Signed-By:
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 .
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 p7qwmJU9/V+PBUCJb9NbOC/PBfI9M4OW5abOjkeajYB6mCJWMBtp13yv1c/Pqix7
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 FzkT6WySwn7knjcHMyx9VNigZjKooC2l+ci2vg9iYVYTEs4tuT3qDAkbOXRO1qbM
 UVKn1SMbWdmgRQOipvzMlqRyoDObOZZrZERy3p5lk57naPXXZ+BWNmJkwI+4N3L0
 2gISzPQCeLJtPtcjHcqv+USZRGdpoHoPTk9bABEBAAG0KlNhbHNhIFBpcGVsaW5l
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 EcbP1rR5yi1xK5nLBQJoyGB8AxsvBAULCQgHAgYVCgkICwIEFgIDAQIeAQIXgAAK
 CRC0ecotcSuZy6MmCADMY6SpPVUJ8SthVV/kQ1xVn0ykLLA/O/dyheEqrxCSXRn4
 t0+Fcyn+jFFzOjWjAuW/okf3+sJKQ5+ZsONr0BfddPiXGqiPijy+uvlkb4QTbsQd
 sRw+Ql5to+lLnVxihoAW/SUAR23AC0tcTx1WNoN7z3jz9b77Q//aEwsb3zjhDbRN
 TRfV7mb62zJoFayWkJEf0xrYpEvKe3DnYHjt6eLrUXZ/l8dbeorsepNsb43of7X4
 k8J610ddWTUYlea1XZCJLufPt1h0N8pQbyDtuyHPNspxPSOIzdseVKOAE5YnhSD7
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 =+Xci
 -----END PGP PUBLIC KEY BLOCK-----
EOF

Alternatively, using the old one-line format, thus: 
$ wget -O - https://salsa.debian.org/go-team/packages/conmon/-/jobs/8291445/artifacts/raw/aptly/public-key.asc | sudo tee /etc/apt/keyrings/salsa-go-team-packages-conmon-8291445.asc >/dev/null
$ sudo tee /etc/apt/sources.list.d/salsa-go-team-packages-conmon-8291445.list >/dev/null <<EOF
deb [signed-by=/etc/apt/keyrings/salsa-go-team-packages-conmon-8291445.asc] https://salsa.debian.org/go-team/packages/conmon/-/jobs/8291445/artifacts/raw/aptly unstable main
# deb-src [signed-by=/etc/apt/keyrings/salsa-go-team-packages-conmon-8291445.asc] https://salsa.debian.org/go-team/packages/conmon/-/jobs/8291445/artifacts/raw/aptly unstable main
EOF

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