Add openssl to package installs for AlmaLinux 10

AlmaLinux 10 base image does not include openssl by default (AL9 did).
Add it explicitly to all three Dockerfiles since it's needed for
self-signed cert generation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile.shared-httpd

@@ -4,7 +4,7 @@ FROM almalinux/10-base
 RUN dnf install -y \
       https://dl.fedoraproject.org/pub/epel/epel-release-latest-10.noarch.rpm && \
     dnf update -y && \
-    dnf install -y httpd mod_ssl iproute cronie procps curl && \
+    dnf install -y httpd mod_ssl openssl iproute cronie procps curl && \
     dnf clean all && \
     rm -rf /var/cache/dnf /usr/share/doc /usr/share/man /usr/share/locale/*