The base image of "release Varnish" is now Debian (bookworm-slim).

Installed from pkg.uplex.de.

container/Dockerfile.varnish

-FROM centos:centos7.9.2009
-
-COPY varnishcache_varnish66.repo /etc/yum.repos.d/
-COPY uplex_varnish.repo /etc/yum.repos.d/
-
-# yum update with --exclude=shadow-utils because the cap_set_file
-# capability is needed to extract the RPM, and that fails in a
-# docker build.
-RUN yum install -y -q epel-release && yum -q makecache -y fast && \
-    yum update -y -q --exclude=shadow-utils && \
-    yum install -y -q varnish-6.6.2 && \
-    yum install -y -q --nogpgcheck vmod-re2-2.0.0 && \
-    yum install -y -q --nogpgcheck vmod-selector-2.6.0 && \
-    yum install -y -q --nogpgcheck vmod-dynamic-2.5.0 && \
-    yum install -y -q --nogpgcheck vmod-blobdigest-1.7.0 && \
-    yum install -y -q --nogpgcheck varnish-objvar-1.0.0 && \
-    yum -q clean all && rm -rf /var/cache/yum && rm -rf /usr/share/man && \
-    rm -rf /usr/share/doc && rm /etc/varnish/*
-
-RUN /bin/mkdir /var/run/varnish
+FROM debian:bookworm-20240311-slim
+ENV VERSION=20240307
+ENV DIST=bookworm-varnish
+ENV POOL=varnish
+
+RUN apt-get update && \
+	apt-get upgrade -y && \
+	apt-get install -y curl gnupg coreutils procps
+
+# add uplex repository and import gpg key
+RUN echo "deb https://pkg.uplex.de/dpkg/${VERSION}/ ${DIST} ${POOL}" | tee -a /etc/apt/sources.list
+RUN curl -L https://pkg.uplex.de/dpkg/uplex-varnish.gpg.key | apt-key add -
+RUN apt-get clean && \
+	apt-get update
+
+RUN apt-get install -y varnish \
+    libvmod-re2 \
+    libvmod-selector \
+    libvmod-dynamic \
+    libvmod-blobdigest \
+    varnish-objvar
+
+RUN apt-get remove -y -q curl gnupg && \
+    apt-get autoremove -y -q && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/* && \
+    rm -rf /usr/share/doc && \
+    rm -rf /usr/share/man
+
+# Set the varnish GID to 998 as in the packagecloud install.
+RUN /bin/mkdir /run/varnish && \
+    /usr/sbin/groupmod -g 998 varnish
+
 COPY bogo_backend.vcl /etc/varnish/
 COPY ok.vcl /etc/varnish/
 COPY notavailable.vcl /etc/varnish
@@ -25,8 +38,6 @@ COPY boot.vcl /etc/varnish
 COPY start.cli /etc/varnish
 
 COPY varnishd_exec.sh /
-RUN /usr/sbin/useradd -r -g varnish -d /var/lib/varnish -s /sbin/nologin \
-	-u 102 vcache
 RUN /bin/chmod 755 /varnishd_exec.sh /etc/varnish
 
 ENV HTTP_PORT=8888 PROTO=HTTP READY_PORT=8080 SECRET_PATH=/var/run/varnish \