MB-69924: Ensure perl-core is present on single linux image

OpenSSL 3.5.4 builds error out if perl-core is not present.
This change also switches back to ftp.gnu.org from the mirror
url, as it is currently serving 502s.

Change-Id: I52e19f054c9ec4961d52722bb7b4cf4f75e5ab63
Reviewed-on: https://review.couchbase.org/c/build-infra/+/238005
Tested-by: Blair Watt <[email protected]>
Reviewed-by: Ming Ho <[email protected]>

Author: udkyo

docker-stacks/couchbase-server/server-jenkins-agents.yaml

@@ -151,7 +151,7 @@ services:
     <<: *default-jenkins-one-agent
 
   linux-single:
-    image: couchbasebuild/server-linux-build:20251104
+    image: couchbasebuild/server-linux-build:20251222
     environment:
       - "JENKINS_SLAVE_NAME=server-linux"
       - "JENKINS_SLAVE_LABELS=server python3 linux linux-asan all monster neo elixir morpheus trinity cypher x86_64"

docker/buildslaves/couchbase-server/single/Dockerfile

@@ -51,7 +51,7 @@ FROM base-compile AS sed-compile
 WORKDIR /tmp
 ARG SED_VERSION=4.9
 ARG SED_SHA=6aac9b2dbafcd5b7a67a8a9bcb8036c3
-ADD https://ftpmirror.gnu.org/gnu/sed/sed-${SED_VERSION}.tar.xz /tmp/sed.tar.xz
+ADD https://ftp.gnu.org/gnu/sed/sed-${SED_VERSION}.tar.xz /tmp/sed.tar.xz
 RUN set -x \
     && echo ${SED_SHA} /tmp/sed.tar.xz | md5sum -c - \
     && mkdir /tmp/sed && cd /tmp/sed \
@@ -86,9 +86,9 @@ ARG AUTOMAKE_VER
 ARG LIBTOOL_VER
 RUN ulimit -n 1024 && yum install -y --setopt=skip_missing_names_on_install=False --setopt=keepcache=0 perl-Data-Dumper m4
 RUN cd /tmp && mkdir autoconf automake libtool
-RUN curl -Lf http://ftpmirror.gnu.org/autoconf/autoconf-${AUTOCONF_VER}.tar.gz | tar xz --strip-components=1 -C /tmp/autoconf
-RUN curl -Lf http://ftpmirror.gnu.org/automake/automake-${AUTOMAKE_VER}.tar.gz | tar xz --strip-components=1 -C /tmp/automake
-RUN curl -Lf http://ftpmirror.gnu.org/libtool/libtool-${LIBTOOL_VER}.tar.gz | tar xz --strip-components=1 -C /tmp/libtool
+RUN curl -Lf http://ftp.gnu.org/gnu/autoconf/autoconf-${AUTOCONF_VER}.tar.gz | tar xz --strip-components=1 -C /tmp/autoconf
+RUN curl -Lf http://ftp.gnu.org/gnu/automake/automake-${AUTOMAKE_VER}.tar.gz | tar xz --strip-components=1 -C /tmp/automake
+RUN curl -Lf http://ftp.gnu.org/gnu/libtool/libtool-${LIBTOOL_VER}.tar.gz | tar xz --strip-components=1 -C /tmp/libtool
 RUN cd /tmp/autoconf && ./configure --prefix=/usr/local && make -j && make install
 RUN cd /tmp/automake && ./configure --prefix=/usr/local && make -j && make install
 RUN cd /tmp/libtool && ./configure --prefix=/usr/local && make -j && make install
@@ -304,7 +304,7 @@ RUN set -x \
     && yum install -y texinfo gmp-devel mpfr-devel && yum clean all \
     && mkdir -p /opt/gdb-${GDB_VER} /tmp/gdb \
     && cd /tmp/gdb \
-    && curl -Lf https://ftpmirror.gnu.org/gnu/gdb/gdb-${GDB_VER}.tar.gz -o - \
+    && curl -Lf https://ftp.gnu.org/gnu/gdb/gdb-${GDB_VER}.tar.gz -o - \
         | tar xz --strip-components=1 \
     && ./configure --prefix=/opt/gdb-${GDB_VER} \
     && make -j$(nproc) \
@@ -315,6 +315,7 @@ RUN set -x \
 # Perl modules
 RUN ulimit -n 1024 && \
     yum install -y  --setopt=skip_missing_names_on_install=False --setopt=keepcache=0 \
+        perl-core \
         perl-Data-Dumper \
         perl-Digest-SHA \
         perl-Digest-MD5 \