Fix keyserver error

[michalpirgl]

Fix keyserver error for gpg

53 | # install latest postgresql-client 54 | >>> RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ bullseye-pgdg main' > /etc/apt/sources.list.d/pgdg.list
55 | >>> && GNUPGHOME="$(mktemp -d)"
56 | >>> && export GNUPGHOME
57 | >>> && repokey='B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8'
58 | >>> && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "${repokey}"
59 | >>> && gpg --batch --armor --export "${repokey}" > /etc/apt/trusted.gpg.d/pgdg.gpg.asc
60 | >>> && gpgconf --kill all
61 | >>> && rm -rf "$GNUPGHOME"
62 | >>> && apt-get update
63 | >>> && apt-get install --no-install-recommends -y postgresql-client
64 | >>> && rm -f /etc/apt/sources.list.d/pgdg.list
65 | >>> && rm -rf /var/lib/apt/lists/* 66 |

ERROR: failed to solve: process "/bin/bash -xo pipefail -c echo 'deb http://apt.postgresql.org/pub/repos/apt/ bullseye-pgdg main' > /etc/apt/sources.list.d/pgdg.list && GNUPGHOME="$(mktemp -d)" && export GNUPGHOME && repokey='B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8' && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "${repokey}" && gpg --batch --armor --export "${repokey}" > /etc/apt/trusted.gpg.d/pgdg.gpg.asc && gpgconf --kill all && rm -rf "$GNUPGHOME" && apt-get update && apt-get install --no-install-recommends -y postgresql-client && rm -f /etc/apt/sources.list.d/pgdg.list && rm -rf /var/lib/apt/lists/*" did not complete successfully: exit code: 2