diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index a635734..649e6aa 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -6,24 +6,25 @@ on:
       - "back001/**"
       - "front001/**"
       - ".forgejo/workflows/**"
+      - "ci/**"
   pull_request:
 
 jobs:
   backend:
     runs-on: docker
     container:
-      image: gradle:8.7-jdk21
+      image: mosenioring/ci-gradle-node:8.7
     steps:
-      - name: Install git
-        run: |
-          apt-get update
-          apt-get install -y --no-install-recommends git ca-certificates
-          git --version
+      - uses: actions/checkout@v4
 
-      - name: Checkout (git)
-        run: |
-          git clone "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}" .
-          git checkout "${GITHUB_SHA}"
+      - uses: actions/cache@v4
+        with:
+          path: |
+            /home/gradle/.gradle/caches
+            /home/gradle/.gradle/wrapper
+          key: gradle-${{ runner.os }}-${{ hashFiles('back001/**/*.gradle*', 'back001/**/gradle-wrapper.properties') }}
+          restore-keys: |
+            gradle-${{ runner.os }}-
 
       - name: Test + build (backend)
         working-directory: back001
@@ -32,18 +33,17 @@ jobs:
   flutter:
     runs-on: docker
     container:
-      image: ghcr.io/cirruslabs/flutter:stable
+      image: mosenioring/ci-flutter-node:stable
     steps:
-      - name: Install git
-        run: |
-          apt-get update
-          apt-get install -y --no-install-recommends git ca-certificates
-          git --version
+      - uses: actions/checkout@v4
 
-      - name: Checkout (git)
-        run: |
-          git clone "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}" .
-          git checkout "${GITHUB_SHA}"
+      - uses: actions/cache@v4
+        with:
+          path: |
+            /root/.pub-cache
+          key: pub-${{ runner.os }}-${{ hashFiles('front001/mosenioring/pubspec.lock') }}
+          restore-keys: |
+            pub-${{ runner.os }}-
 
       - name: Analyze + test (flutter)
         working-directory: front001/mosenioring