try bun instead of turbo prune and yarn install

.github/workflows/test_backend.yml

@@ -47,25 +47,22 @@ jobs:
           node-version: '18.20.7'
 
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
             
       - name: docker-compose mariadb
         run: docker compose -f docker-compose.yml -f docker-compose.test.yml up --detach --no-deps mariadb
-    
-      - name: Install turbo
-        run: yarn global add turbo@^2
 
-      - name: Prune backend with turbos help
-        run: turbo prune backend
+      - name: install bun 
+        uses: oven-sh/setup-bun@v2
 
       - name: install dependencies
-        run: cd out && yarn install --frozen-lockfile --production=false
+        run: bun install --frozen-lockfile --production=false
 
       - name: Wait for MariaDB to be ready
         run: docker run --rm --network gradido_internal-net busybox sh -c 'until nc -z mariadb 3306; do echo waiting for db; sleep 1; done;'
 
       - name: Backend | Unit tests
-        run: cd out && turbo backend#test backend#build
+        run: bun turbo backend#test backend#build
 
   typecheck:
     if: needs.files-changed.outputs.backend == 'true'
@@ -81,19 +78,14 @@ jobs:
         with:
           node-version: '18.20.7'
 
-      - name: Install turbo
-        run: yarn global add turbo@^2
-
-      - name: Prune backend with turbos help
-        run: turbo prune backend
+      - name: install bun 
+        uses: oven-sh/setup-bun@v2
 
       - name: install dependencies
-        run: |
-          cd out && yarn install --frozen-lockfile --production=true
-          cd backend && yarn add typescript
+        run: bun install --frozen-lockfile --production=true
 
       - name: Backend | Typecheck
-        run: cd out && turbo backend#typecheck
+        run: bun turbo backend#typecheck
 
   locales:
     if: needs.files-changed.outputs.backend == 'true'

backend/turbo.json

@@ -9,6 +9,9 @@
     "lint": {
       "dependsOn": ["locales", "database#build"]
     },
+    "typecheck": {
+      "dependsOn": ["database#build", "config-schema#build"]
+    },
     "test": {
       "dependsOn": ["database#up:backend_test", "config-schema#build", "database#build"]
     },