You can configure a system to make use of this repository, thus: 
$ sudo tee /etc/apt/sources.list.d/salsa-bzed-rrdtool-8567962.sources >/dev/null <<EOF
Types: deb
URIs: https://salsa.debian.org/bzed/rrdtool/-/jobs/8567962/artifacts/raw/aptly
Suites: unstable
Components: main
Signed-By:
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 .
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 mTwifrjhPAt6dofCtCwR288OWrQpQkML2LiZqbyMGXT093uRVa58Iccj+yMM7UZU
 CwXdivGX1s3voZN9mABgZ5JENmMyqngz4usdABEBAAG0KlNhbHNhIFBpcGVsaW5l
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 OVzRYMq5alCzPrfkP1Upq33NdwOrxb714YeBD8w4fFvhk5K9GvklSuoKjSeRW38o
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 NEcu4XtnPXKLZC8RUcPZaBpOdiVZKkGMCbICJyDacKP3N2LrLtQ4543NgAtz8UQH
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 =qvnI
 -----END PGP PUBLIC KEY BLOCK-----
EOF

Alternatively, using the old one-line format, thus: 
$ wget -O - https://salsa.debian.org/bzed/rrdtool/-/jobs/8567962/artifacts/raw/aptly/public-key.asc | sudo tee /etc/apt/keyrings/salsa-bzed-rrdtool-8567962.asc >/dev/null
$ sudo tee /etc/apt/sources.list.d/salsa-bzed-rrdtool-8567962.list >/dev/null <<EOF
deb [signed-by=/etc/apt/keyrings/salsa-bzed-rrdtool-8567962.asc] https://salsa.debian.org/bzed/rrdtool/-/jobs/8567962/artifacts/raw/aptly unstable main
# deb-src [signed-by=/etc/apt/keyrings/salsa-bzed-rrdtool-8567962.asc] https://salsa.debian.org/bzed/rrdtool/-/jobs/8567962/artifacts/raw/aptly unstable main
EOF

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