You can configure a system to make use of this repository, thus: 
$ sudo tee /etc/apt/sources.list.d/salsa-installer-team-partman-auto-crypto-4638083.sources >/dev/null <<EOF
Types: deb
URIs: https://salsa.debian.org/installer-team/partman-auto-crypto/-/jobs/4638083/artifacts/raw/aptly
Suites: unstable
Components: main
Signed-By:
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 .
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 iud9wt+fcmf1eeecY2yN3prMFVv1E2D69ka3uVeWEGxm6pBgtYnsb3C+LnAIKWCF
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 8CWEJy4flHzJ/zwc6N/sCPvg/H/v1RpbbWebJ3GKs3c3jKu81V0o3jSE2V7I5BpN
 Wdv4OxmlIjY030fhoiWWEHQTMSDdWq221g23ABEBAAG0KlNhbHNhIFBpcGVsaW5l
 IDxzYWxzYS1waXBlbGluZUBkZWJpYW4ub3JnPokBTgQTAQoAOBYhBCX7VbPfcaqR
 0VlaRM8L4pJD9wU4BQJk8XncAhsvBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJ
 EM8L4pJD9wU4aTYH/2eO4AljLhw78QGoJK7q0pvcscef0BJngHBmqW8Ay7eR3Chr
 Dqg+jIM0oNUY4QTE8f4FoF+yUdkO/J7TLfcXbnvMPN9WXRWzneCdt1oU71xoRQLq
 Y12S5F317N+MmFWqC+rbJgNiC8p7ehFCsa+XuEDkjQ2nGttGBtwGriO8uGRnnV0S
 GhnewnLjLuiwb4ftDh/tsKGGe2y7EWAEsCGb2WZ7NdSpgeL5Lrf8vKyJErTm2j4O
 UJ4UmwjUzqcsarp6Hy355fvDsxByi8+Iq0ZUOHxoy03sGfE43T9HZv9gpTG8y0DJ
 y2dGp0Fn7zWP8SrOEpWqvtyl8p8KMSpntH7Wh1E=
 =3ng2
 -----END PGP PUBLIC KEY BLOCK-----
EOF

Alternatively, using the old one-line format, thus: 
$ wget -O - https://salsa.debian.org/installer-team/partman-auto-crypto/-/jobs/4638083/artifacts/raw/aptly/public-key.asc | sudo tee /etc/apt/keyrings/salsa-installer-team-partman-auto-crypto-4638083.asc >/dev/null
$ sudo tee /etc/apt/sources.list.d/salsa-installer-team-partman-auto-crypto-4638083.list >/dev/null <<EOF
deb [signed-by=/etc/apt/keyrings/salsa-installer-team-partman-auto-crypto-4638083.asc] https://salsa.debian.org/installer-team/partman-auto-crypto/-/jobs/4638083/artifacts/raw/aptly unstable main
# deb-src [signed-by=/etc/apt/keyrings/salsa-installer-team-partman-auto-crypto-4638083.asc] https://salsa.debian.org/installer-team/partman-auto-crypto/-/jobs/4638083/artifacts/raw/aptly unstable main
EOF

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