ci: update

Author: yetist

.github/docker/Dockerfile

@@ -1,3 +1,5 @@
 FROM ghcr.io/loongarchlinux/archlinux:latest
 ARG TARGETARCH
-RUN pacman --noconfirm -Syu
+RUN --mount=type=cache,target=/var/cache/pacmant,sharing=locked \
+    --mount=type=cache,target=/var/lib/pacman/sync,sharing=locked \
+    pacman --noconfirm -Syu

.github/workflows/docker-images.yml

@@ -7,11 +7,13 @@ on:
     - cron: "0 0 * * FRI"
   pull_request:
     paths:
+      - ".github/docker/Dockerfile"
       - ".github/workflows/docker-images.yml"
   push:
     branches:
       - main
     paths:
+      - ".github/docker/Dockerfile"
       - ".github/workflows/docker-images.yml"
 
 jobs: