diff --git a/.github/workflows/cypress.yml b/.github/workflows/cypress.yml
index 0fd5ab073..33973068b 100644
--- a/.github/workflows/cypress.yml
+++ b/.github/workflows/cypress.yml
@@ -11,23 +11,8 @@ jobs:
       # matrix:
       #  containers: [1, 2] # Uses 2 parallel instances
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Set up Node
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20
-
-      - name: Set up Ruby for Jekyll
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 3.2.3
-
-      - name: Install dependencies with Yarn
-        run: |
-          yarn install
-          yarn after-install
+      - name: Shared setup
+        uses: ./.github/workflows/shared-action-setup
 
       - name: Cypress run
         # Uses the official Cypress GitHub action https://github.com/cypress-io/github-action
diff --git a/.github/workflows/lighthouse.yml b/.github/workflows/lighthouse.yml
index 4ec7ba533..d0a9af642 100644
--- a/.github/workflows/lighthouse.yml
+++ b/.github/workflows/lighthouse.yml
@@ -12,39 +12,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
-
-      # Install Node and configure its cache.
-      - uses: actions/setup-node@v4
-        with:
-          node-version: 20
-
-      # https://github.com/actions/cache/blob/master/examples.md#node---yarn
-      - name: Get yarn cache directory path
-        id: yarn-cache-dir-path
-        run: echo "dir=.yarn/cache" >> "$GITHUB_OUTPUT"
-
-      - uses: actions/cache@v4
-        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
-        with:
-          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
-          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-yarn-
-
-      # Install Ruby and configure the Bundler cache.
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 3.2.3
-
-      # https://github.com/actions/cache/blob/master/examples.md#ruby---bundler
-      - name: Set up Bundler cache
-        uses: actions/cache@v4
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('**Gemfile.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-gems-
+      - name: Shared setup
+        uses: ./.github/workflows/shared-action-setup
 
       # Build the documentation site.
       # This is needed so we can determine the list of URLs to test.
diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index 5bef05f07..e32b63e27 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -9,13 +9,10 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-node@v4
-        with:
-          node-version: 20
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 3.2.3
-      - uses: actions/checkout@v4
-      - run: ./scripts/update-gh-pages.sh
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Shared setup
+        uses: ./.github/workflows/shared-action-setup
+
+      - name: Update GitHub pages
+        run: ./scripts/update-gh-pages.sh
+          env:
+            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/shared-action-setup/action.yml b/.github/workflows/shared-action-setup/action.yml
new file mode 100644
index 000000000..2cd4355ba
--- /dev/null
+++ b/.github/workflows/shared-action-setup/action.yml
@@ -0,0 +1,20 @@
+name: "Shared action - setup"
+runs:
+  using: "composite"
+  steps:
+    - name: Check out the repo
+      uses: actions/checkout@v4
+
+    - name: Set up Node
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20
+
+    - name: Set up Ruby for Jekyll
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 3.2.3
+
+    - name: Install dependencies with Yarn
+      run: |
+        yarn install
diff --git a/.github/workflows/tests-unit.yml b/.github/workflows/tests-unit.yml
index 04402e2de..6ce47edce 100644
--- a/.github/workflows/tests-unit.yml
+++ b/.github/workflows/tests-unit.yml
@@ -11,16 +11,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - name: Check out the repo
-      uses: actions/checkout@v4
-
-    - name: Set up Node
-      uses: actions/setup-node@v4
-      with:
-        node-version: 20
-
-    - name: Install dependencies with Yarn
-      run: yarn install
+    - name: Shared setup
+      uses: ./.github/workflows/shared-action-setup
 
     - name: Run unit tests
       run: yarn jest