diff --git a/.github/actions/setup-bun/action.yml b/.github/actions/setup-bun/action.yml
new file mode 100644
index 000000000..d4958673e
--- /dev/null
+++ b/.github/actions/setup-bun/action.yml
@@ -0,0 +1,36 @@
+name: Setup Bun workspace
+
+description: Check out-independent Bun setup, cache, optional LFS pull, and install.
+
+inputs:
+  install-args:
+    description: Arguments passed to bun install.
+    required: false
+    default: --frozen-lockfile
+  lfs:
+    description: Pull Git LFS files before installing dependencies.
+    required: false
+    default: 'false'
+
+runs:
+  using: composite
+  steps:
+    - name: Pull LFS files
+      if: inputs.lfs == 'true'
+      shell: bash
+      run: |
+        git lfs install --force
+        git lfs pull
+        head -c 4 tests/fixtures/material3.fig | xxd
+
+    - uses: oven-sh/setup-bun@v2
+
+    - uses: actions/cache@v4
+      with:
+        path: ~/.bun/install/cache
+        key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
+        restore-keys: bun-${{ runner.os }}-
+
+    - name: Install dependencies
+      shell: bash
+      run: bun install ${{ inputs.install-args }}
diff --git a/.github/workflows/app.yml b/.github/workflows/app.yml
index e469287c7..b00eedae6 100644
--- a/.github/workflows/app.yml
+++ b/.github/workflows/app.yml
@@ -18,9 +18,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: oven-sh/setup-bun@v2
-
-      - run: bun install --frozen-lockfile
+      - uses: ./.github/actions/setup-bun
 
       - name: Format check
         run: bun run format:check
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b22b3c85f..5cbee50d4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -36,8 +36,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: oven-sh/setup-bun@v2
-
       - uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.target }}
@@ -53,13 +51,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
 
-      - uses: actions/cache@v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: bun-${{ runner.os }}-
-
-      - run: bun install
+      - uses: ./.github/actions/setup-bun
 
       - name: Extract release notes
         id: changelog
@@ -135,20 +127,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: oven-sh/setup-bun@v2
-
       - uses: actions/setup-node@v4
         with:
           node-version: 24.x
           registry-url: https://registry.npmjs.org/
 
-      - uses: actions/cache@v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: bun-${{ runner.os }}-
-
-      - run: bun install
+      - uses: ./.github/actions/setup-bun
 
       - name: Build packages for publish
         run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 98e3428e0..06ebda4d4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,21 +18,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Pull LFS files
-        run: |
-          git lfs install --force
-          git lfs pull
-          head -c 4 tests/fixtures/material3.fig | xxd
-
-      - uses: oven-sh/setup-bun@v2
-
-      - uses: actions/cache@v4
+      - uses: ./.github/actions/setup-bun
         with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: bun-${{ runner.os }}-
-
-      - run: bun install --frozen-lockfile
+          lfs: 'true'
 
       - name: Format check
         run: bun run format:check
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index dddff6e8d..9913724ff 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -16,9 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: oven-sh/setup-bun@v2
-
-      - run: bun install --frozen-lockfile
+      - uses: ./.github/actions/setup-bun
 
       - run: bun run --filter @open-pencil/docs build
 
diff --git a/.github/workflows/heavy-tests.yml b/.github/workflows/heavy-tests.yml
index 30a41e06c..75704c1e0 100644
--- a/.github/workflows/heavy-tests.yml
+++ b/.github/workflows/heavy-tests.yml
@@ -14,21 +14,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Pull LFS files
-        run: |
-          git lfs install --force
-          git lfs pull
-          head -c 4 tests/fixtures/material3.fig | xxd
-
-      - uses: oven-sh/setup-bun@v2
-
-      - uses: actions/cache@v4
+      - uses: ./.github/actions/setup-bun
         with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: bun-${{ runner.os }}-
-
-      - run: bun install --frozen-lockfile
+          lfs: 'true'
 
       - name: Heavy fig roundtrip tests
         run: bun test --timeout 180000 tests/engine/fig-roundtrip.test.ts
diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
index d09fb5894..108fc2836 100644
--- a/.github/workflows/preview.yml
+++ b/.github/workflows/preview.yml
@@ -27,15 +27,10 @@ jobs:
         with:
           ref: ${{ github.event.pull_request.head.sha }}
 
-      - uses: oven-sh/setup-bun@v2
+      - uses: ./.github/actions/setup-bun
 
-      - uses: actions/cache@v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: bun-${{ runner.os }}-
-
-      - run: bun install --frozen-lockfile
+      - name: Format check
+        run: bun run format:check
 
       - run: bun run build