refactor: move git-sha flag to git:report

plugins/git/internal-functions

@@ -31,6 +31,7 @@ cmd-git-report() {
 
 cmd-git-report-single() {
   declare APP="$1" INFO_FLAG="$2"
+  local APP_DIR="$DOKKU_ROOT/$APP"
   if [[ "$INFO_FLAG" == "true" ]]; then
     INFO_FLAG=""
   fi
@@ -40,6 +41,7 @@ cmd-git-report-single() {
     "--git-global-deploy-branch: $(fn-plugin-property-get "git" "--global" "deploy-branch" "master")"
     "--git-keep-git-dir: $(fn-plugin-property-get "git" "$APP" "keep-git-dir" "false")"
     "--git-rev-env-var: $(fn-plugin-property-get "git" "$APP" "rev-env-var" "GIT_REV")"
+    "--git-sha: $(GIT_DIR="$APP_DIR" git rev-parse --short HEAD 2>/dev/null || false)"
   )
 
   if [[ -z "$INFO_FLAG" ]]; then