ansible: update branch used in clean_binary_tmp.sh (#2978)

Update `clean_binary_tmp.sh` script to reference `main` instead of
`master`.

Fix up the `jenkins-workspace` role to run as the owner of the git
repository when disabling automatic gc.

Fixes: #2977
Refs: nodejs/node#33864

ansible/roles/jenkins-workspace/files/clean_binary_tmp.sh

@@ -4,7 +4,7 @@ cd ~binary_tmp/binary_tmp.git
 (echo; date) >> ~binary_tmp/clean_binary_tmp.log
 du -sh ~binary_tmp/binary_tmp.git/ >> ~binary_tmp/clean_binary_tmp.log
 
-git fetch origin +master:master
+git fetch origin +main:main
 
 for b in $(git branch | sed /\*/d); do
   if [ -z "$(git log -1 --since='7 days ago' -s $b)" ]; then

ansible/roles/jenkins-workspace/tasks/main.yml

@@ -103,6 +103,8 @@
     regexp: "clean_binary_tmp"
 
 - name: Disable automatic garbage collection
+  become: true
+  become_user: binary_tmp
   command: "git config gc.auto 0"
   args:
     chdir: "~binary_tmp/binary_tmp.git/"