fix(librenms): run daily.sh as librenms user with git available

Install git, initialize git metadata for tarball deployments, and execute
daily.sh via su so updates no longer fail with permission or missing git.

ct/librenms.sh

@@ -29,10 +29,21 @@ function update_script() {
     exit
   fi
   setup_mariadb
+  ensure_dependencies git
+  if [[ ! -d /opt/librenms/.git ]]; then
+    msg_info "Initializing LibreNMS git metadata"
+    LIBRENMS_VERSION=$(cat ~/.librenms 2>/dev/null)
+    cd /opt/librenms
+    git init -q
+    git remote add origin https://github.com/librenms/librenms.git
+    git fetch --depth 1 origin "refs/tags/v${LIBRENMS_VERSION}" 2>/dev/null ||
+      git fetch --depth 1 origin "refs/tags/${LIBRENMS_VERSION}" 2>/dev/null || true
+    git checkout -qf FETCH_HEAD 2>/dev/null || true
+    chown -R librenms:librenms .git
+    msg_ok "Initialized LibreNMS git metadata"
+  fi
   msg_info "Updating LibreNMS"
-  su librenms
-  cd /opt/librenms
-  ./daily.sh
+  $STD su - librenms -s /bin/bash -c 'cd /opt/librenms && ./daily.sh'
   msg_ok "Updated LibreNMS"
   exit
 }