Revert "docker: Install archlinux-keyring from source"

This reverts commit d092c54.

docker/Dockerfile

@@ -26,24 +26,6 @@ COPY . $GOPATH/src/github.com/go-debos/debos
 WORKDIR $GOPATH/src/github.com/go-debos/debos/cmd/debos
 RUN go install ./...
 
-# Install the latest archlinux-keyring, since the one in Debian is bound
-# to get outdated sooner or later.
-# WARNING: returning to the debian package will break the pacstrap action
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-        pkgconf \
-        python3-all \
-        sq \
-        systemd \
-        make && \
-    rm -rf /var/lib/apt/lists/*
-
-RUN git clone https://gitlab.archlinux.org/archlinux/archlinux-keyring && \
-    cd archlinux-keyring && \
-    git checkout master && \
-    make build && \
-    make PREFIX=/usr KEYRING_TARGET_DIR=/usr/share/keyrings/ DESTDIR=/arch-keyring install
-
 ### second stage - runner ###
 FROM debian:bookworm-slim as runner
 
@@ -109,6 +91,7 @@ RUN apt-get update && \
         zstd \
         makepkg \
         pacman-package-manager \
+        archlinux-keyring \
         arch-install-scripts && \
     rm -rf /var/lib/apt/lists/*
 
@@ -120,9 +103,4 @@ RUN for arch in aarch64 alpha arm armeb cris hexagon hppa m68k microblaze mips m
 
 COPY --from=builder $GOPATH/bin/debos /usr/local/bin/debos
 
-# Install the latest archlinux-keyring, since the one in Debian is bound
-# to get outdated sooner or later.
-# WARNING: returning to the debian package will break the pacstrap action
-COPY --from=builder /arch-keyring/usr/share/keyrings /usr/share/keyrings
-
 ENTRYPOINT ["/usr/local/bin/debos"]