diff --git a/.github/workflows/test_all.yml b/.github/workflows/test_all.yml
new file mode 100644
index 0000000..4c56f15
--- /dev/null
+++ b/.github/workflows/test_all.yml
@@ -0,0 +1,33 @@
+name: Test all installers
+on:
+  schedule:
+    # To decrease the chance of delay, avoid the start of the hour.
+    # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule
+    - cron: "17 5 * * *"
+  workflow_dispatch:
+
+jobs:
+  list_installers:
+    name: List installers
+    runs-on: ubuntu-latest
+    outputs:
+      installers: ${{steps.list_step.outputs.installers}}
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: List installers
+        id: list_step
+        run: |
+          {
+            printf "installers="
+            find programs -mindepth 1 -maxdepth 1 -printf "%P\n" \
+            | sort | jq -R | jq -s -c -M
+          } >> "$GITHUB_OUTPUT"
+
+  test_installers:
+    name: Test installers
+    needs: list_installers
+    uses: ./.github/workflows/test_installers.yml
+    with:
+      installers: ${{needs.list_installers.outputs.installers}}
diff --git a/.github/workflows/test_installer.yml b/.github/workflows/test_installer.yml
deleted file mode 100644
index dd72dde..0000000
--- a/.github/workflows/test_installer.yml
+++ /dev/null
@@ -1,54 +0,0 @@
-name: Test Installer
-on:
-  schedule:
-    # To decrease the chance of delay, avoid the start of the hour.
-    # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule
-    - cron: "17 5 * * *"
-  workflow_dispatch:
-
-jobs:
-  list_installers:
-    name: List installers
-    runs-on: ubuntu-latest
-    outputs:
-      installers: ${{ steps.list_step.outputs.installers}}
-    steps:
-      - name: Check out code
-        uses: actions/checkout@v4
-
-      - name: List installers
-        id: list_step
-        run: |
-          {
-            printf "installers="
-            find programs -mindepth 1 -maxdepth 1 -printf "%P\n" \
-            | sort | jq -R | jq -s -c -M
-          } >> "$GITHUB_OUTPUT"
-
-  test_installers:
-    name: Test installers
-    needs: list_installers
-    runs-on: ubuntu-latest
-    container:
-      image: ${{matrix.os}}
-    strategy:
-      fail-fast: false
-      matrix:
-        installer: ${{ fromJson(needs.list_installers.outputs.installers) }}
-        os: ["ubuntu:20.04", "ubuntu:22.04"]
-    steps:
-      - name: Check out code
-        uses: actions/checkout@v4
-
-      - name: Prepare Docker
-        run: ./scripts/prepare_docker.bash
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Install ${{matrix.installer}}
-        shell: su norm --command "bash --login {0}"
-        run: programs/${{matrix.installer}}/install.bash
-
-      - name: Install ${{matrix.installer}} again (test idempotency)
-        shell: su norm --command "bash --login {0}"
-        run: programs/${{matrix.installer}}/install.bash