[CI] Use a custom firesim docker image

.circleci/Dockerfile

@@ -0,0 +1,10 @@
+# Docker images hosted at firesim/firesim-ci
+FROM centos:centos7.6.1810
+
+RUN yum -y install sudo epel-release
+# aws fpga dev ami comes with this: pip2
+RUN yum -y install python-pip
+
+RUN adduser centos
+RUN usermod -aG wheel centos
+RUN echo "centos ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers

.circleci/config.yml

@@ -1,12 +1,13 @@
 # Use the latest 2.1 version of CircleCI pipeline process engine. See: https://circleci.com/docs/2.0/configuration-reference
 version: 2.1
 executors:
-    main-env:
-        docker:
-          - image: centos:centos7.6.1810
-        environment:
-            JVM_MEMORY: 2200m # Customize the JVM maximum heap limit
-            LANG: en_US.UTF-8 # required by sbt when it sees boost directories
+  main-env:
+    docker:
+      - image: firesim/firesim-ci:wip
+        user: "centos"
+    environment:
+        JVM_MEMORY: 2200m # Customize the JVM maximum heap limit
+        LANG: en_US.UTF-8 # required by sbt when it sees boost directories
 
 commands:
   dockerprep:
@@ -15,7 +16,7 @@ commands:
       - checkout
       - run:
           command: |
-            .circleci/dockerprep.sh
+            sudo .circleci/dockerprep.sh
 
   machinelaunchscript:
     description: "Run firesim's machine launch script"

.circleci/dockerprep.sh

@@ -2,22 +2,13 @@
 
 set -e
 
+pwd
 # expect firesim to be checked out for prep scripts.
 ls -la /
 
-ls -la /root/
+ls -la /home/centos/
 
-ls -la /root/project/
-
-yum -y install sudo epel-release
-yum -y install python-pip # aws fpga dev ami comes with this: pip2
-
-# you will be root, so:
-adduser centos
-usermod -aG wheel centos
-
-# let the new acct run sudo without password
-echo "centos ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+ls -la /home/centos/project/
 
 # fixes to machine launch script to merge later:
 sudo yum -y install dtc # TODO: replace in machine-launch script, now available in epel