docker: avoid /tmp write access issues by fixing permissions

contrib/packaging/docker/rhel8

@@ -1,18 +1,21
 FROM rockylinux/rockylinux:8
 
 RUN groupadd -g %GID% build && \
     useradd -u %UID% -g %GID% -s /bin/bash -d /build -m build
 
 RUN yum install -y \
 	gcc \
 	gettext \
 	make \
 	python3-devel \
 	python3-docutils \
 	rpm-build
 
 # For creating repo meta data
 RUN yum install -y createrepo
 
 # For rust extensions
 RUN yum install -y cargo
+
+# avoid incorrect docker image permissions on /tmp preventing writes by non-root users
+RUN chmod 1777 /tmp