applaying gh issue suggestion

actions/runner-images#2840 (comment)

.github/workflows/build_tiber.yml

@@ -54,18 +54,17 @@ jobs:
     - name: "Preparation: Repository Checkout"
       uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
-    - name: "Configuration: Docker with Buildx Toolkit set up"
-      uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
-      with:
-        buildkitd-flags: --debug
-
     - name: "Validation: Build/Push Dokcerfile"
       run: | 
         docker build $(cat versions.env | xargs -I {} echo --build-arg {}) \
                             --tag ${{ env.DOCKER_IMAGE_NAME }}:${{ env.DOCKER_IMAGE_TAG }} \
                             --target final-stage \
                             -f Dockerfile .
 
+    - name: "remove unnecessary files"
+      run: | 
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
 
     - name: "Validation: Run Trivy vulnerability scanner on image"
       uses: aquasecurity/trivy-action@595be6a0f6560a0a8fc419ddf630567fc623531d # v0.22.0