You can configure a system to make use of this repository, thus: 
$ sudo tee /etc/apt/sources.list.d/salsa-go-team-packages-conmon-7088399.sources >/dev/null <<EOF
Types: deb
URIs: https://salsa.debian.org/go-team/packages/conmon/-/jobs/7088399/artifacts/raw/aptly
Suites: unstable
Components: main
Signed-By:
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 .
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 wviZHzOw6/PQbyy3pWdQoKBhm952tbQs31C0HZNi3ro0h9TBieci7eIIT2F6o9Ea
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 9JzN5FNePKYYTZeZSSXmKadlQfWiLLfoKQytXwc9cvzuoObgPern0jHZTu+9QJ4A
 yvnfq8M9s3ilZRLCSGO/UzvaRgbf4QTzN7HvABEBAAG0KlNhbHNhIFBpcGVsaW5l
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 CRCmH8YhUXb7kgASB/9eJ63q6PBbYOZKgWdfYMhjlsz8g2W18Nbkm+T7tl17kXpn
 /vhuPTX0C3PoFAPOo3GNvCYNVtzQk5g/jrvLKFHggUOnPzbz7Y0nyw//gWDjdlYW
 5PMHwjfDmP53je7uOFitluzJtqplLXmD3KXJ4nh5bHHRCXVZpMKnKxEG+OuWlvPJ
 J/YTEX0Vu3mguigxt1k0YzigY7WXCFHW6C+wjc4ZyXeQE/ytfG9vNc2wE6ntzgiL
 /q+xb9DwrYMuaAq6krTTqvjzchUwbrxF97nCPkvhWy8CTe6KLGxqyfAVR+XdT3I0
 hEMD4KnCev64TGl2EZ84wBLq4mI90R7GqL8kZE4k
 =8VbI
 -----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/7088399/artifacts/raw/aptly/public-key.asc | sudo tee /etc/apt/keyrings/salsa-go-team-packages-conmon-7088399.asc >/dev/null
$ sudo tee /etc/apt/sources.list.d/salsa-go-team-packages-conmon-7088399.list >/dev/null <<EOF
deb [signed-by=/etc/apt/keyrings/salsa-go-team-packages-conmon-7088399.asc] https://salsa.debian.org/go-team/packages/conmon/-/jobs/7088399/artifacts/raw/aptly unstable main
# deb-src [signed-by=/etc/apt/keyrings/salsa-go-team-packages-conmon-7088399.asc] https://salsa.debian.org/go-team/packages/conmon/-/jobs/7088399/artifacts/raw/aptly unstable main
EOF

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