Update for main as dev branch

.github/workflows/firesim-cull-instances.yml

@@ -20,7 +20,5 @@ jobs:
       TERM: xterm-256-color
     steps:
       - uses: actions/checkout@v2
-        with:
-          ref: dev
       - uses: ./.github/actions/repo-setup-aws
       - run: .github/scripts/cull-old-ci-instances.py

.github/workflows/firesim-publish-scala-doc.yml

@@ -3,7 +3,7 @@ name: firesim-publish-scala-doc
 on:
   push:
     branches:
-      - dev
+      - main
     tags:
       - '[0-9]*.[0-9]*.[0-9]*'
 

.github/workflows/firesim-run-tests.yml

@@ -1,11 +1,9 @@
 name: firesim-ci-process
 
 on:
-  # run ci when pring to dev/master/main (note: ci runs on the merge commit of the pr!)
+  # run ci when pring to main (note: ci runs on the merge commit of the pr!)
   pull_request:
     branches:
-      - dev
-      - master
       - main
 
 env: