Remove explicit dirmngr reference

This is pulled in automatically via `gnupg`, and moved from `Recommends` to `Depends` in https://salsa.debian.org/debian/gnupg2/-/commit/99474ad900a8bcdd0e7b68f986fec0013fc01470, which has been part of `src:gnupg2` since 2.1.21-4 (and every supported version of both Debian _and_ Ubuntu have 2.2.x 😇).

Author: tianon

11/bullseye/Dockerfile

@@ -1,15 +1,5 @@
 FROM debian:{{ env.variant }}-slim
 
-RUN set -ex; \
-	if ! command -v gpg > /dev/null; then \
-		apt-get update; \
-		apt-get install -y --no-install-recommends \
-			gnupg \
-			dirmngr \
-		; \
-		rm -rf /var/lib/apt/lists/*; \
-	fi
-
 # explicitly set user/group IDs
 RUN set -eux; \
 	groupadd -r postgres --gid=999; \
@@ -20,6 +10,13 @@ RUN set -eux; \
 	mkdir -p /var/lib/postgresql; \
 	chown -R postgres:postgres /var/lib/postgresql
 
+RUN set -ex; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		gnupg \
+	; \
+	rm -rf /var/lib/apt/lists/*
+
 # grab gosu for easy step-down from root
 # https://github.com/tianon/gosu/releases
 ENV GOSU_VERSION 1.16
@@ -75,7 +72,7 @@ RUN set -ex; \
 	mkdir -p /usr/local/share/keyrings/; \
 	gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "$key"; \
 	gpg --batch --export --armor "$key" > /usr/local/share/keyrings/postgres.gpg.asc; \
-	command -v gpgconf > /dev/null && gpgconf --kill all; \
+	gpgconf --kill all; \
 	rm -rf "$GNUPGHOME"
 
 ENV PG_MAJOR {{ env.version }}