ci: centralize bun setup to reduce duplication and improve caching

.github/workflows/snapshot.yml

@@ -24,21 +24,7 @@ jobs:
           cache: true
           cache-dependency-path: go.sum
 
-      - uses: oven-sh/setup-bun@v2
-        with:
-          bun-version: 1.3.0
-
-      - name: Cache ~/.bun
-        id: cache-bun
-        uses: actions/cache@v3
-        with:
-          path: ~/.bun
-          key: ${{ runner.os }}-bun-1-3-0-${{ hashFiles('bun.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-bun-1-3-0-
-
-      - name: Install dependencies
-        run: bun install
+      - uses: ./.github/actions/setup-bun
 
       - name: Publish
         run: |