add cache to ci

.gitea/workflows/build.yml

@@ -45,6 +45,15 @@ jobs:
               else
                 echo "build=false" >> $GITHUB_OUTPUT
               fi
+          - name: Cache Pacman Data
+            uses: actions/cache@v4
+            with:
+              path: |
+                /var/cache/pacman/pkg
+                /var/lib/pacman/sync
+              key: pacman-cache-${{ github.run_id }}
+              restore-keys: |
+                pacman-cache-
                   
           - name: Build Package
             if: steps.compare.outputs.build == 'true'