Addressing linting concerns (#1296)

Author: MovieStoreGuy

scripts/package-tests/Dockerfile.test.deb

@@ -2,8 +2,8 @@
 # `-d --privileged -v /sys/fs/cgroup:/sys/fs/cgroup:ro` flags
 FROM debian:13@sha256:8f6a88feef3ed01a300dafb87f208977f39dccda1fd120e878129463f7fa3b8f
 
-ENV container docker
-ENV DEBIAN_FRONTEND noninteractive
+ENV container=docker \
+    DEBIAN_FRONTEND=noninteractive
 
 # Enable systemd.
 RUN apt-get update ; \

scripts/package-tests/Dockerfile.test.rpm

@@ -2,7 +2,7 @@
 # `-d --privileged -v /sys/fs/cgroup:/sys/fs/cgroup:ro` flags
 FROM rockylinux/rockylinux:10.1@sha256:f4da504c18e7aced902f4f728cde787cd9d9b817bc639fe171026d18364dca6c
 
-ENV container docker
+ENV container=docker
 
 RUN dnf install -y initscripts