Switch to libreswan-minimal in the gateway

This reduces the image size (219MiB instead of 238MiB) and drops all
the systemd dependencies.

Signed-off-by: Stephen Kitt <skitt@redhat.com>

Author: skitt

package/Dockerfile.submariner-gateway

@@ -1,5 +1,5 @@
 ARG BASE_BRANCH=devel
-ARG FEDORA_VERSION=42
+ARG FEDORA_VERSION=43
 ARG SOURCE=/go/src/github.com/submariner-io/submariner
 
 FROM --platform=${BUILDPLATFORM} quay.io/submariner/shipyard-dapper-base:${BASE_BRANCH} AS builder
@@ -24,7 +24,7 @@ COPY package/dnf_install /
 # kmod is required so that libreswan can load modules
 RUN /dnf_install -a ${TARGETPLATFORM} -v ${FEDORA_VERSION} -r /output/gateway \
     glibc bash glibc-minimal-langpack coreutils-single \
-    libcurl-minimal iproute libreswan kmod \
+    libcurl-minimal iproute libreswan-minimal kmod \
     openssl nss-tools
 
 FROM scratch