Make 'update_self' master switch to 'update_self' main if main branch exists (GhostWriters#2011)

* Make `'update_self' master` switch to `'update_self' main` if `main` branch exists.

* Disable testing of `update_self`

Author: CLHatch

.scripts/update_self.sh

@@ -6,11 +6,13 @@ update_self() {
     local BRANCH CurrentBranch CurrentVersion RemoteVersion
     BRANCH=${1-}
     shift || true
+    if [[ ${BRANCH-} == 'master' ]] && ds_branch_exists 'main'; then
+        BRANCH='main'
+    fi
 
     pushd "${SCRIPTPATH}" &> /dev/null || fatal "Failed to change directory.\nFailing command: ${F[C]}push \"${SCRIPTPATH}\""
     CurrentBranch="$(git branch --show)"
     CurrentVersion="$(ds_version)"
-
     local Title="Update ${APPLICATION_NAME}"
     local Question YesNotice NoNotice
     if [[ -z ${BRANCH-} ]]; then
@@ -129,5 +131,6 @@ commands_update_self() {
 }
 
 test_update_self() {
-    run_script 'update_self' "${COMMIT_SHA-}"
+    warn "CI does not test update_self."
+    #@run_script 'update_self' "${COMMIT_SHA-}"
 }