Update apt to apt-get and POSIX & changed to tester fleet

.cicd/pipeline.yml

@@ -440,7 +440,7 @@ steps:
   - label: ":docker::ubuntu: Docker - Build 18.04 Docker Image"
     command: "./.cicd/create-docker-from-binary.sh"
     agents:
-      queue: "automation-eks-eos-builder-fleet"
+      queue: "automation-eks-eos-tester-fleet"
     timeout: 10
 
   - label: ":git: Git Submodule Regression Check"

docker/dockerfile

@@ -2,7 +2,8 @@ FROM ubuntu:18.04
 
 COPY *.deb /
 
-RUN apt update && \
-    apt install -y /*.deb && \
-    rm -rf /*.deb /var/lib/apt/lists/*
+RUN apt-get update && \
+    apt-get install -y /*.deb && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*